On the east side of San Juan, the snorkeling at Balneario El Escambron is very popular for its protected waters. The best snorkeling is at Playa #9 and in the protected waters off the Caribe Hilton Resort. The Balneario El Escambron is part of the Tercer Milenio Park.
To reach Puerto Rico by air, fly into Luis Munoz Marin International Airport (SJU). Isla Caja de Muerto is located about 5 miles off the coast. While there used to be a government-operated ferry, there is now only one private snorkeling charter tour boat. The entire islands is within the Caja de Muertos Island Nature Reserve.
Overall, Balneario El Escambron is the 14th most popular snorkel dive spot of all 17 snorkeling dives in Puerto Rico.