West of the airport and Piti, the snorkeling at Cabras Island offers divers the chance to see the largest coral heads in the waters off Guam. These huge coral heads are known to be bigger than many local vehicles. Start from the Family Beach parking area and then high north through the breakwater and explore the shallow seas on the north side of Cabras Island. Watch out for the steady westerly currents, so keep an eye on the shore to make sure you can get back.
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.
Overall, Cabras Island is the 12th most popular snorkel dive spot of all 17 snorkeling dives in Guam.