Buck Island St Croix, U.S. Virgin Islands
Buck Island is an uninhabited satellite island off St. Croix, a national monument where only 176 of the park’s 19,000 acres are above ground, the snorkelling is legendary. The elkhorn coral reef that surrounds two-thirds of the island has extraordinary formations and deep grottoes in crystal-clear waters (think 100-foot visibility) at an average depth of 13 feet.