These islands are an hour away from Cartagena. There is an open water aquarium, where you'll enjoy a dolphin show, sharks, giant turtles, and all kinds of tropical reef fauna. The islands are coral formations which have grown in size over hundreds of years, so just about anywhere you will find good Snorkling and Scuba Diving. Also, the Rosario's still waters make it attractive for water sking, canoing, swimming and wind surfing.