West of the airport in the Fish Eye Marine Park, the snorkeling at Piti Bomb Holes has quantities of marine life to observe. There are over 200 species of fish to be found here. During a Piti Bomb Holes snorkeling dive, you may encounter anemone, sergeant majors, butterflyfish, moorish idols lionfish, barracuda, moray eels and trumpetfish. To access the snorkeling, you will need to park just south of the Fish Eye Marine Park in Piti. Start by snorkeling out along the pier heading out to deep water. The reef on the south side of the observatory is particularly healthy. The best time for snorkeling Piti Bomb Holes is at high-tide in order to get past the eel grass in the shallows.
To reach the Guam snorkeling by air, fly into the Antonio B. Won Pat International Airport (GUM) which is located in the middle of the island.
While the dry season is typically January to June, the best snorkeling on Guam is during the months of May through August. The highest water clarity can be found if there is an incoming tide during the morning. While snorkeling in Guam, keep an eye out for green sea turtles, hawksbill turtles and dozens of species of sharks. Overall, there are over 700 species of reef fish and over 300 species of coral on the fringing reefs. Most snorkelers stay within the fringing reef since there is usually a strong current just beyond the reef. There are a couple lesser well-known snorkeling dive sites off the east coast of Guam, which should only be attempted during the local summer months and then only with extreme care.
The Piti Bomb Holes snorkeling dive site in the Fish Eye Marine Park is located just to the north of Apra Harbor.
Overall, Piti Bomb Holes is the 10th most popular snorkel dive spot of all 17 snorkeling dives in Guam.