We went on the boat tour offered from the Biscayne National Park Visitor Center. There are two boat trips. The boat first goes to Boca Chita Key, drops off the Boca Chita visitors, and then goes out to the snorkeling site for a few hours, then returns to Boca Chita and then back to the Visitor Center. We chose to see Boca Chita. We toured the lighthouse, hiked around the island, then ate our picnic lunch we had brought with us. The picnic grounds are beautiful. There are restrooms and a small beach. The boat captain is outstanding, really informative and funny. There was light wind that day and several of the snorkelers told us on the way back they wished they had seen the island instead, as the snorkeling was not very good.