San Juan is not the best place on the island for diving, but there are a couple of decent reefs just offshore. Ocean Sports, at Avda Ashford 1035 in Condado (787/723-8513, www.osdivers.com) and Avda Isla Verde 77 in Isla Verde (787/268-2329) offers dives for certified divers from $85. Scuba Dogs ( 787/783-6377, www.scubadogs.net) also maintains the artificial Escambrón Marine Park near the beach of the same name, the perfect place for learners.
San Juan has a justifiably good reputation for deep-sea fishing: lines go out just twenty minutes offshore, with blue and white marlin the top attractions, but plenty of snapper, dolphinfish, wahoo, sailfish and tuna to aim for as well. The most professional expeditions are arranged by Mike Benítez’ Sport Fishing (787/723-2292, www.mikebenitezsportfishing.com) and depart from the Club Náutico de San Juan on Avenida Fernández Juncos, at the eastern end of Puerta de Tierra. Charters for a maximum of six people cost $650 for a half-day or $210 per fisherman and $90 per passenger.
For windsurfing, head to Punta Las Marías (east of Ocean Park) and the four-mile reef about half a mile out, which is one of the best wave-sailing spots on the island. To get started, visit Velauno at c/Loíza 2430 (787/728-8716, www.velauno.com), close to the top end of Isla Verde and five blocks from the beach. This huge shop is the primary wind- and kite-surfing centre in the city. Beginner lessons cost $110 for two hours, including boards. Nearby is Beach Cats, at c/Loíza 2434 (787/727-0883, beachcatspr.com), another wind- and kite-surfing specialist that organizes lessons and rents boards.
Many companies that run boat trips from Villa Marina and Puerto del Rey on the east coast offer transport to and from San Juan.