Sitting at the southern end of Tumon Bay on Guam's west coast, Ypao Beach Park is a free public beach that falls inside the Tumon Bay Marine Preserve, so fishing and coral collecting are banned there and the reef tends to be in better shape than most of the bay. The water stays knee-to-waist deep for a good stretch off the sand before shelving off gradually toward the outer reef, and the coral patch on the beach's left (south) side regularly turns up bright reef fish, giant clams, moray eels, and sea cucumbers — making it one of the more reliable walk-in snorkel spots on the island, especially for kids and first-timers. Typical depth runs about 1-2.5 m (shallower at low tide), with visibility around 5-10 m on a calm day. As of July 2026 it's still a free, easy-access spot served by the Tumon shuttle, though summer overlaps with typhoon season so swell and clarity can vary from day to day.
The coral patch on the beach's south side, thick with colorful reef fish
Giant clams, moray eels, and sea cucumbers scattered across the reef flat
A gentle, gradually deepening entry that's forgiving for kids and beginners
One of Tumon Bay's comparatively better-preserved reefs, thanks to marine preserve status
A well-known sunset spot at the south end of Tumon Bay
Good to know
SafetyAt low tide the water over the coral gets shallow fast, so hands, knees, or fins can scrape against it — reef shoes are a good idea.
SafetyPast the outer reef edge, currents and rip currents aren't visible from the surface; stay inside the reef line rather than swimming out to it.
SafetyLifeguards aren't on duty at all hours, so don't snorkel alone — bring a buddy and a signal float or buoy.
SeasonGuam's typhoon season runs roughly July through November, which can bring rougher surf and murkier water; the dry season (December-June) is generally more reliable for snorkeling.
RulesThe beach lies within the Tumon Bay Marine Preserve, so fishing, spearfishing, and taking coral or shells are prohibited, and you shouldn't stand on or touch the coral.
MannersGive moray eels, turtles, and other marine life space — don't touch, chase, or feed them.
SafetyJellyfish can show up seasonally; if you see clear, gelatinous creatures in the water, it's best to get out and wait it out.
Practical info
It's roughly a 10-minute shuttle ride or walk from the main Tumon hotel strip, with free parking and a direct beach entry — no admission fee to snorkel, only for optional gear rental or kayak/SUP tours. Lifeguard hours and any surf or typhoon advisories change, so check current local conditions before you go.
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