White-sand beaches, calm clear water and a bountiful barrier reef make the Turks and Caicos island of Providenciales a hot spot for families, snorkelers and divers. Some call rock-free Grace Bay Beach the best in the world. For an unusual experience, divers can walk along the ocean floor at Smith's Reef, where underwater signs describe the reef's ecosystem. Additional destinations include Iguana Island (home of endangered rock iguanas), the country's only golf course, art galleries and a casino.