On the southwest corner of Guam, the snorkeling at Merizo Pier Park is known for excellent diving. There are numerous species of hard corals.
The best time of day for Merizo Pier Park snorkeling is slack high tide for the highest visibility. The most popular reef for snorkeling is Achang Reef Flat.
Note: Occasionally, the Merizo Pier Park area has jellyfish that you need to watch out for.
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, Merizo Pier Park is the 5th most popular snorkel dive spot of all 17 snorkeling dives in Guam.