The smaller of the two main islands and the headquarters of the Honduras Coral Reef Foundation, the body that manages the marine protected area. Day visitors land at the research station, pay the park fee, and can walk a short forest trail to a lookout point and the lighthouse on top of the hill. The view from the top takes in the whole archipelago and, on clear days, the mountains of the mainland to the south.
The island's main biological draw is the endemic pink boa — a smaller, paler relative of the common boa constrictor that occurs only here. They are harmless and rarely seen on the trail, but the research station sometimes has one in residence. The reef immediately offshore is the most heavily monitored section of the archipelago and a reliable spot for snorkelling straight off the beach.