Snorkelers see dolphins and even migrating humpback whales in the winter. Cotton cay, a 4-mile uninhabited island just north east of Salt Cay, is a popular snorkeling destination. You get to see underwater jungles of elk horn coral with nurse sharks and sting rays. A ship that wrecked there in 1790 is still clearly visible, as it’s just 20 feet underneath you. Many areas offer 100-foot visibility. The water is pristine, and has some of the best reefs in the region.