Southwest of Pyga Beach off the southwest coast of Guam, the snorkeling in Cocos Lagoon north of Cocos Island is known for the coral heads spread along the sand flats. During Cocos Lagoon snorkeling, you may encounter skipjacks, barracuda and octopus in waters from 3 to 30 feet deep.
While out at Cocos, make sure to check out the waters off the small sand bar. Known as Bikini Island, you’ll find good stands of staghorn coral that are teeming with marine life.
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. The Cocos Lagoon snorkeling dive is accessible from Pyga Beach via the Cocos Crossing Ferry Line.
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, Cocos Lagoon is the 3rd most popular snorkel dive spot of all 17 snorkeling dives in Guam.