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Guam🇬🇺 | national parksTumon Bay Marine PreserveYpao pavilions, Gun Beach reef, protected bay, Two Lovers cliff | things to do and best time to go

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Backpacking in Tumon Bay Marine Preserve
👍 Recommendednational park ranked #3
By Johan Kruseman 🇳🇱 | Updated October 7, 2026

Tumon Bay Marine Preserve is a territorial reserve run by Guam’s Division of Aquatic and Wildlife Resources, and its walking is a flat shoreline stroll with no summits or trail networks. It sits on the west coast in the north of Guam, in front of the hotel strip. The upside is easy, protected reef water where fishing and collecting are banned, so fish are bold and the bay is calm on most mornings. The downside is crowds on weekends, a busy road behind the sand, and little shade at some beaches. Wear reef shoes, since the shallows are sharp, and bring reef-safe sunscreen. Don’t stand on coral, and skip the pricey rental shops by bringing your own mask. Swim early, before the wind builds, and park at public lots instead of paying hotel rates. A good first day: snorkel Gun Beach by 8 a.m., stroll to Ypao for lunch under the pavilions, then watch sunset from the sand.

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✨ Why go?
Ranked #3 national park in GuamWhat makes it a must-see national park

Backpackers come for water you can enter for free, on your own schedule. Ypao Beach Park and Gun Beach are public, so you need no tour boat, no guide and no booking to get in the water with parrotfish, butterflyfish and coral heads in the shallows. Bring a mask, snorkel and fins, and you have a full morning of independent exploring that costs nothing beyond the gear. The bay’s protected status since the late 1990s is the other draw. Because fishing and shell collecting are banned, the reef is livelier than most of the unprotected shoreline up and down the island, which makes it a good place to practice snorkeling before heading to rougher spots. The strip behind the sand holds convenience stores, cheap local plate lunches and the tourist shuttle stops, so you can organize a whole day on foot. … read more 👉
Backpackers come for water you can enter for free, on your own schedule. Ypao Beach Park and Gun Beach are public, so you need no tour boat, no guide and no booking to get in the water with parrotfish, butterflyfish and coral heads in the shallows. Bring a mask, snorkel and fins, and you have a full morning of independent exploring that costs nothing beyond the gear. The bay’s protected status since the late 1990s is the other draw. Because fishing and shell collecting are banned, the reef is livelier than most of the unprotected shoreline up and down the island, which makes it a good place to practice snorkeling before heading to rougher spots. The strip behind the sand holds convenience stores, cheap local plate lunches and the tourist shuttle stops, so you can organize a whole day on foot. Pick this place for self-guided swimming and sunsets. For hiking, look to the island’s southern hills.

💡 HighlightsTop highlights of Tumon Bay Marine Preserve

  1. Ypao Beach Park: The bay’s best-known public beach, at the south end, with shaded pavilions, picnic tables, showers and a sandy entry to the water. Locals fill the pavilions on weekends, so arrive early for a table.
  2. Gun Beach snorkeling: At the north end, a Japanese World War II gun emplacement still sits near the sand. Offshore, the reef starts close in, with coral heads and schools of small reef fish.
  3. Tumon Bay reef flat: The shallow reef protected by the preserve rules. Look for parrotfish, butterflyfish, sea cucumbers and the occasional green sea turtle. Look but don’t touch.
  4. Matapang Beach Park: A quieter public beach in the middle of the bay, with grass, a small picnic area and easy water access. It works well when Ypao is crowded.
  5. Two Lovers Point (Puntan Dos Amantes): A cliff overlook
… read more 👉
  1. Ypao Beach Park: The bay’s best-known public beach, at the south end, with shaded pavilions, picnic tables, showers and a sandy entry to the water. Locals fill the pavilions on weekends, so arrive early for a table.
  2. Gun Beach snorkeling: At the north end, a Japanese World War II gun emplacement still sits near the sand. Offshore, the reef starts close in, with coral heads and schools of small reef fish.
  3. Tumon Bay reef flat: The shallow reef protected by the preserve rules. Look for parrotfish, butterflyfish, sea cucumbers and the occasional green sea turtle. Look but don’t touch.
  4. Matapang Beach Park: A quieter public beach in the middle of the bay, with grass, a small picnic area and easy water access. It works well when Ypao is crowded.
  5. Two Lovers Point (Puntan Dos Amantes): A cliff overlook at the north end of the bay, high above the water. It has a paid entry, a legend about two lovers, and a view over the whole curve of the preserve.
  6. Underwater World Guam: A walk-through aquarium on the bay’s strip, with a long glass tunnel. It has an entry fee and makes a dry, shaded break on a rainy afternoon.
Gun Beach in the morning and Two Lovers Point at sunset combine well in one day, since both sit at the northern end of the bay.
Spotted a mistake or missing something? Contact us.

Things to do around Tumon Bay Marine Preserve

Taotao Tasi the Beach Dinner Show in Guam

Taotao Tasi the Beach Dinner Show in Guam

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per personViator
BIG Sunset Cruise - Dinner & Dolphin Watching in Guam

BIG Sunset Cruise - Dinner & Dolphin Watching in Guam

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per personViator
Experience Scuba Diving - No Certification Needed!

Experience Scuba Diving - No Certification Needed!

5.0(23) 2h 30m
From €82
per personViator
Karera Show at Sand Castle Guam

Karera Show at Sand Castle Guam

4.5(24) 1h
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per personViator
Fish Eye Island Cultural Dinner Show Buffet Course

Fish Eye Island Cultural Dinner Show Buffet Course

4.3(6) 2h 50m
From €87
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Dolphin Watching Cruise with Underwater Observatory Viewing

Dolphin Watching Cruise with Underwater Observatory Viewing

3.8(6) 2h 20m
From €49
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Eco Snokeling in Piti Bay Marine

Eco Snokeling in Piti Bay Marine

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Island Costume Heritage & Coconut Experience

Island Costume Heritage & Coconut Experience

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Underwater Observatory & Coconut Experience

Underwater Observatory & Coconut Experience

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Island Dinner Show Cultural show BBQ Fiesta Plate Course

Island Dinner Show Cultural show BBQ Fiesta Plate Course

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Ratings based on Tripadvisor reviews. When you book through this link, you support our work at no extra cost to you.

🌤️ When to go?Best time to explore Tumon Bay Marine Preserve

The calmest, clearest water in Tumon Bay comes from December to May, when visibility often reaches 20 to 30 m (65 to 100 ft) and the reef flat is glassy.
  • Dry Season (December to May): Highs of 28 to 31°C (82 to 88°F), lows near 24°C (75°F), steady trade winds and less rain. Snorkeling is best now, and sunrise is around 6:15 am with sunset near 6:00 pm.
  • Wet Season (July to November): Daily showers and humid 27 to 31°C (81 to 88°F) days. Water stays bathtub warm, but runoff can cloud the bay for a day or two after heavy rain. This is peak typhoon risk, so flexible plans matter.
  • Peak Crowds and Prices: Japanese and Korean holiday weeks (Golden Week, Obon, late December to New Year) fill the Tumon hotel strip and push room rates up noticeably. Weekdays are quiet on the reef.
  • Shoulder Months (June,
… read more 👉
The calmest, clearest water in Tumon Bay comes from December to May, when visibility often reaches 20 to 30 m (65 to 100 ft) and the reef flat is glassy.
  • Dry Season (December to May): Highs of 28 to 31°C (82 to 88°F), lows near 24°C (75°F), steady trade winds and less rain. Snorkeling is best now, and sunrise is around 6:15 am with sunset near 6:00 pm.
  • Wet Season (July to November): Daily showers and humid 27 to 31°C (81 to 88°F) days. Water stays bathtub warm, but runoff can cloud the bay for a day or two after heavy rain. This is peak typhoon risk, so flexible plans matter.
  • Peak Crowds and Prices: Japanese and Korean holiday weeks (Golden Week, Obon, late December to New Year) fill the Tumon hotel strip and push room rates up noticeably. Weekdays are quiet on the reef.
  • Shoulder Months (June, early December): Fewer visitors, lower rates, and decent conditions.
Snorkel at high tide or just after, since the inner reef flat gets shallow and scrapey at low tide.


source: climatestotravel.comJANJanuary: excellent for travelingFEBFebruary: excellent for travelingMARMarch: highly recommended for travelingAPRApril: highly recommended for travelingMAYMay: highly recommended for travelingJUNJune: fair for travelingJULJuly: fair for travelingAUGAugust: fair for travelingSEPSeptember: fair for travelingOCTOctober: fair for travelingNOVNovember: good for travelingDECDecember: fair for traveling
guam-national-park-tumon-bay-marine-preserve
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🛏️ Where to stay?How to pick the right area

Stay in Tumon itself, because the whole marine preserve is a short walk from the hotel strip along Pale San Vitores Road. There is no lodging or camping inside the preserve, which is a shoreline reef protected for snorkeling and swimming, so you sleep in town and walk to the water.
Hostel options are thin on Guam. A few budget guesthouses and small inns sit on the Tumon side streets and in nearby Tamuning, where dorm-style or private rooms generally run US$40 to 90 a night. Larger resort hotels line the beach and cost US$150 and up, though shoulder-season sales can bring older properties down to … read more 👉
Stay in Tumon itself, because the whole marine preserve is a short walk from the hotel strip along Pale San Vitores Road. There is no lodging or camping inside the preserve, which is a shoreline reef protected for snorkeling and swimming, so you sleep in town and walk to the water.
Hostel options are thin on Guam. A few budget guesthouses and small inns sit on the Tumon side streets and in nearby Tamuning, where dorm-style or private rooms generally run US$40 to 90 a night. Larger resort hotels line the beach and cost US$150 and up, though shoulder-season sales can bring older properties down to around US$100. Many rooms have kitchenettes, which helps with grocery runs to the stores near the strip.
Tamuning, just south, has cheaper motels, local restaurants, and is about 10 minutes from Tumon by car or the tourist shuttle. Hagåtña, the capital, is 20 to 30 minutes away and has fewer rooms but a quieter feel.
For the best beach access, look at places near Tumon Sands Plaza and the Ypao Beach end. Public access paths run between the hotels, so you do not need to be a guest to reach the sand.
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Best quality hotels in Guam

👛 Costs (as of 7 October 2026)Money, prices, and spending tips

Expect to spend about US$105 to 250 a day for Tumon Bay Marine Preserve if you stay in budget lodging and self-cater part of the time.
CategoryBudget RangeLocal Reality
Entrance FeeUS$0The beaches and reef are free to enter, and public access paths cut between hotels.
Accommodation (high season)US$60 to 150Basic guesthouses and older hotels in Tumon or Tamuning; beachfront resorts start near US$150 and climb steeply.
Food and SuppliesUS$25 to 55Plates at local spots cost US$10 to 18, while grocery runs and kitchenettes bring costs down. Resort dining is much pricier.
Local TransportUS$10 to 25The Tumon tourist shuttle and taxis cover short hops, and the strip is walkable. A rental car runs US$40 to 70 a day but is optional if you stay in Tumon.
Gear and ActivitiesUS$10 to 20Mask and snorkel rentals
… read more 👉
Expect to spend about US$105 to 250 a day for Tumon Bay Marine Preserve if you stay in budget lodging and self-cater part of the time.
CategoryBudget RangeLocal Reality
Entrance FeeUS$0The beaches and reef are free to enter, and public access paths cut between hotels.
Accommodation (high season)US$60 to 150Basic guesthouses and older hotels in Tumon or Tamuning; beachfront resorts start near US$150 and climb steeply.
Food and SuppliesUS$25 to 55Plates at local spots cost US$10 to 18, while grocery runs and kitchenettes bring costs down. Resort dining is much pricier.
Local TransportUS$10 to 25The Tumon tourist shuttle and taxis cover short hops, and the strip is walkable. A rental car runs US$40 to 70 a day but is optional if you stay in Tumon.
Gear and ActivitiesUS$10 to 20Mask and snorkel rentals cost around US$10 to 20 a day, and buying a basic set pays off over several days.
Total Daily BudgetUS$105 to 250Per person, per day, in high season.
⚠️ Prices can change and everyone travels differently, so take this as a rough guide. Hope it helps you plan your adventure!

🥾 TrailsTrail guide for Tumon Bay Marine Preserve national park

The preserve has no named trails, so the walking is along the shoreline and the sidewalk behind it. Here are the routes people actually do.
  • Bay shoreline walk: Start at Ypao Beach Park and follow the sand and the sidewalk along Pale San Vitores Road toward Gun Beach. Expect roughly an hour at an easy pace on flat, mostly paved ground, with long sunny stretches and few shaded benches.
  • Reef snorkel loop: Enter at Gun Beach or Ypao, swim parallel to shore over the reef flat for 45 minutes to 2 hours. It’s easy in calm water, but the current picks up near the reef edge, so stay inside it.
  • Gun Beach emplacement
… read more 👉
The preserve has no named trails, so the walking is along the shoreline and the sidewalk behind it. Here are the routes people actually do.
  • Bay shoreline walk: Start at Ypao Beach Park and follow the sand and the sidewalk along Pale San Vitores Road toward Gun Beach. Expect roughly an hour at an easy pace on flat, mostly paved ground, with long sunny stretches and few shaded benches.
  • Reef snorkel loop: Enter at Gun Beach or Ypao, swim parallel to shore over the reef flat for 45 minutes to 2 hours. It’s easy in calm water, but the current picks up near the reef edge, so stay inside it.
  • Gun Beach emplacement stop: A short walk of a few minutes from the sand to the old Japanese gun position, on level ground.
  • Two Lovers Point lookout: A short, paved climb from the parking area to the viewing platforms, finishing in about 20 minutes with photos.
Wildlife is mostly underwater: reef fish, sea cucumbers, urchins and now and then a turtle. Terrain is sand, rubble and sharp coral, so reef shoes help. Fishing, collecting and touching coral are prohibited. Beaches are free, though Two Lovers Point and Underwater World charge admission. Public transport is limited, but the hotel strip is served by the Guam tourist shuttle and Guam Regional Transit Authority buses, so you can leave a rental car behind. Weekends bring local families and tour groups, while weekday mornings are calm.
⚠️ Hiking info can sometimes be outdated or inaccurate. Before you hit the trail, check the latest conditions with locals. If you do spot anything that's off, I'd love to hear from you, so I can update it for fellow travelers.

🛡️ SafetyTraveler Safety Guide

Tumon Bay is one of the easier places on Guam to swim, with a shallow reef flat and lifeguards at some hotel beaches, but the reef edge is where trouble starts. Rip currents form at channel gaps in the reef, especially in the wet season or when swell is up, so check the posted flags and stay inside the breaking line. Never turn your back on waves near the edge.
The bigger daily risk is the sun and the reef itself. Wear a rash guard and reef-safe sunscreen, and drink more water than seems necessary. Coral cuts get infected fast in tropical water, so clean them promptly. Do not stand on coral, which is also protected, and shuffle your feet in sandy patches to avoid stonefish and sea urchins.
Sharks are rarely an issue inside the bay. Jellyfish appear occasionally, and box jellyfish are usually … read more 👉
Tumon Bay is one of the easier places on Guam to swim, with a shallow reef flat and lifeguards at some hotel beaches, but the reef edge is where trouble starts. Rip currents form at channel gaps in the reef, especially in the wet season or when swell is up, so check the posted flags and stay inside the breaking line. Never turn your back on waves near the edge.
The bigger daily risk is the sun and the reef itself. Wear a rash guard and reef-safe sunscreen, and drink more water than seems necessary. Coral cuts get infected fast in tropical water, so clean them promptly. Do not stand on coral, which is also protected, and shuffle your feet in sandy patches to avoid stonefish and sea urchins.
Sharks are rarely an issue inside the bay. Jellyfish appear occasionally, and box jellyfish are usually seasonal, so ask a lifeguard. Leave valuables out of parked rental cars, because break-ins at beach lots happen.
Check Country Safety

FAQCommon questions from travelers

One full day covers the snorkeling and beach time at Tumon Bay Marine Preserve, though two days lets you wait out weather and tides. The reef is best at high tide, so plan 2 to 3 hours in the water in the morning. Many travelers combine it with Two Lovers Point, about 10 minutes north by car, and the Ypao Beach area.
Yes, because the preserve runs along the Tumon hotel strip and you can walk to the water from most lodging. The Tumon tourist shuttle and taxis cover hops along Pale San Vitores Road, and Tamuning is about 10 minutes away. A car is only useful for trips to southern Guam, such as Umatac, roughly 45 minutes from Tumon.
No entrance fee or permit is needed to swim or snorkel at Tumon Bay Marine Preserve, and the beach access paths are open to the public. Fishing, collecting shells or coral, and feeding fish are restricted inside the preserve, so keep to looking only. Gear rental costs roughly US$10 to 20 a day if you do not bring your own.
⚠️ Things can change over time, so always validate details locally before you go.

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We 💚 feedbackFinal thoughts on exploring Tumon Bay Marine Preserve

The classic mistake is snorkeling at midday, when the wind has chopped the surface, the sun is brutal and the beach is packed. Get in the water by 8 a.m., when the bay is glassy and the fish are active, then hide under a Ypao pavilion for lunch. Bring your own mask and reef shoes, and take your sunset break at Two Lovers Point.

✍️ Help improve this page!
The information on this page is based on in-depth research, insights shared by experienced travelers, and feedback from the local travel community in Guam. While every effort is made to keep the information accurate and current, conditions can change — so if you spot anything incorrect or outdated, please get in touch.



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Johan, backpacker and founder of TakeYourBackpackHi, I’m Johan (Netherlands 🇳🇱), the creator of TakeYourBackpack. Over the past 3 decades, I’ve backpacked through 90+ countries across six continents, gaining extensive experience with independent travel, long-term trips, and overland routes.

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