North of the airport on the north end of Tumon Bay, the snorkeling at Gun Beach offers diverse marine life and excellent visibility. Gun Beach is considered to be one of the prettiest beaches on Guam. The snorkeling is very accessible from the beach but is best when the waters are very calm. There is a pipe leading out through the reef that can be followed to get to the outer wall (also known as the cable cut). In addition to the shore access, this dive site can be accessed by boat and there is a mooring buoy available. The best time of day to snorkel is during the transition from low to high tide. During Gun Beach snorkeling, you may encounter barracuda, cuttlefish, spinner dolphins, manta rays and sharks in the waters ranging from 20 to 100 feet deep.
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 Gun Beach snorkeling dive site is located on the north end of Tumon Bay just north of the Hotel Nikko Guam.
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, Gun Beach is the 11th most popular snorkel dive spot of all 17 snorkeling dives in Guam.