Once one of the island's prime swimming spots, BOCA CHICA curves along a small protected bay, with transparent Caribbean water paralleling a long line of beach shacks. Sadly, the town has become so overwhelmed with tourism - and an accompanying plethora of shysters and informal "guides" - that it's no longer the best spot along the coast to spend some time, and a major draw these days is prostitution. Sitting on the beach is the main daytime activity, and the waters are low and calm enough for a good swim. Expect a big crowd on weekends.