For more information see
The Official Puerto Rico website
www.seepuertorico.com
Scuba diving in Puerto Rico
Metropolitan San Juan: This easy
beach dive off the Condado district in San Juan is not as spectacular as other dives mentioned here, but it's certainly more convenient. Lava reefs sculptured with caverns, tunnels, and overhangs provide hiding areas for schools of snapper, grunts, and copper sweepers.
Mona Island: Mona Island, 40 miles (64km) west of the city of Mayagüez in western Puerto Rico, is the Caribbean version of the Galápagos Islands. Renowned for its pirate tales, cave-pocked cliffs, 3-foot-long (.9m) iguanas, and other natural wonders, its waters are among the cleanest in Puerto Rico, with horizontal visibility at times exceeding 200 feet (61m). More than 270 species of fish have been found in Mona waters, including more than 60 reef-dwelling species.
Southern Puerto Rico: The continental shelf drops off precipitously several miles off the southern coast, producing a dramatic wall 20 miles (32km) long and teeming with marine life. Compared favorably to the wall in the Cayman Islands, this Puerto Rican version has become the Caribbean's newest world-class dive destination.
Fajardo: This coastal town in eastern Puerto Rico offers divers the opportunity to explore reefs, caverns, miniwalls, and channels near a string of palm-tufted islets. The reefs are decked in an array of corals ranging from delicate gorgonians to immense coral heads.
Humacao Region: South of Fajardo are some 24 dive sites in a 5-mile (8km) radius off the shore. Overhangs, caves, and tunnels perch in 60 feet (18m) of water along mile-long (1.6km) Basslet Reef, where dolphins visit in spring. The Cracks, a jigsaw of caves, alleyways, and boulders, hosts an abundance of goby-cleaning stations and a number of lobsters.
Read more at:
http://www.frommers.com/destinations/puertorico/0094027716.html or
http://www.diveguide.com/p2046.htm
http://www.lonelyplanet.com/puerto-rico/activities/scuba-diving