Bonaire, a thinly populated, barren-looking island, is part of the Netherlands Antilles. While the island itself is the top of an underground mountain in the Caribbean Sea, the surrounding water is a world-famous diving area. The entire west coast has coral reefs, and water sports draw many of the island's tourists. While windsurfers flock to Lac Bay, divers and snorkelers are lured by the 111-square-mile Bonaire Marine Park and about 370 underwater species. The underwater area is protected so it will remain pristine.