Fodor's Expert Review La Cueva de los Peces
South of Playa Larga, on the east side of the Bay of Pigs, lies this natural aquarium in a 61-meter-deep (201-foot-deep) cenote (a flooded sinkhole filled with multicolor fish that swim in from the bay via a subterranean passage). Diving through the banks of fish and the lush subaquatic vegetation is superb. There is no entrance fee—you walk along a short, shaded trail to the pool and dive in. There's a makeshift, on-site dive shop with tanks, as well as snorkeling gear to rent. If you plan on doing a lot of snorkeling and care about hygiene, bring along your own mask. You can also snorkel from the beach, across the road from the entrance to the cenote. La Casa del Pescador (see Where to Eat, below) is next to the cenote.