Fish Eye Marine Park sits inside the Piti Bomb Holes Marine Preserve on Guam's west coast, built around an underwater observatory reached by a long wooden pier over Piti Bay. More than 200 fish species and roughly 80-100 coral species crowd the preserve, giving it some of the densest reef life on the island, and certified-lifeguard guides accompany every eco-snorkel tour, so first-timers and weak swimmers can join with reasonable confidence. The boat channel runs 2.5-4.5m deep while the reef flat stays a shallow 1-2m, and 10-20m visibility keeps the coral and fish easy to spot from the surface. As of 2026 the park still runs its eco-snorkel, underwater-observatory, and dolphin-watch cruise programs year-round.
Underwater observatory (glass-walled pavilion) reached via a 1,000-ft wooden boardwalk
The 'bomb hole' formations β natural freshwater percolation pits ringed by dense coral and fish
Guide- and lifeguard-accompanied eco-snorkel tour with life vests provided
Optional add-on dolphin-watching cruise
Seasonal night-snorkel tours
Good to know
SafetyThe boat channel can run a stronger current and is shared with dolphin-cruise and other boat traffic β don't swim it alone, stay with the guided group, and wear the life vest provided.
SafetyCoral and rock can scrape skin and hide sea urchin spines; wear reef shoes and avoid standing or putting your feet down on the bottom.
SafetyJuly accounts for roughly 25-30% of Guam's annual jellyfish-sting reports, and box jellyfish appear sporadically β skip entry if any are spotted and flag lifeguards immediately.
RulesPiti Bomb Holes is a no-take marine preserve β collecting coral, shells, or fish, and fishing, are all prohibited.
RulesGuam law bans the sale/import of sunscreens containing oxybenzone, octinoxate, or octocrylene β bring a mineral-based, reef-safe sunscreen only.
MannersDon't stand on or touch the coral, and keep your distance from dolphins on the cruise leg β no feeding or chasing.
SeasonTours run year-round, but the wetter months (roughly July-November) bring more squalls and choppier visibility β check current weather and tour status before booking.
Practical info
It's about a 15-20 minute drive west of Guam International Airport (also close from Tumon), right on Marine Corps Drive in Piti; most visitors arrive via a pickup-included package tour or drive and park themselves. The snorkel tour is a reservation-based package with gear rental included, so confirm current pricing, schedule, and pickup details before booking.
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