Desecheo Island is the only island in Puerto Rico that is closed for its tourists because of its unexploded military artillery. Even if the island is closed, it's still a major spot and is permitted for snorkelling and diving. The island waters can be reached by renting a private boat to enjoy with a prior booking. More than 20 dive sites are well accessible for tourists visiting the island and even guided snorkelling and diving are very popular near Desecheo.