This document provides information about St. Martin's Island in Bangladesh. It states that St. Martin's Island is the only coral island in Bangladesh, located about 9 km south of Cox's Bazar. It has a local name that translates to "Coconut Island". The passage notes that St. Martin's Island has become a popular tourist spot. It then lists some activities students have posted about, including pictures of Cox's Bazar, a BBC quiz about holidays, and writing about visiting St. Martin's Island or Cox's Bazar as a tourist.