Balneario Seven Seas (Carr. 987, beside Las Cabezas de San Juan, Las Croabas, 787/796-1052, daily 6 a.m.–6 p.m., $3) is a great beach for swimming and snorkeling. For underwater action, check out the reef on the far eastern end of the beach. Camping for RVs and tents is also available, although quarters are close so don’t expect much privacy. Call 787/863-8180 for reservations.