Cocos Island National Park
Located 350 miles off the Pacific coast of Costa Rica, volcanic Cocos is the only island in the tropical eastern Pacific with a tropical rainforest. This provides a habitat for 70 endemic species of plants. Because the reef surrounding the island stands close to the edge of a deep maritime trench, the park rates as one of the world's best places to see large deep-sea fish such as sharks, whales, green turtles, rays, tuna and dolphins.