The best snorkelling is between Coral Gardens and the Lighthouse. You can enter the water at one and snorkel to the other. Check the current current direction at the Dive Shop if you want to know which way will be easiest. There are cut-outs of the reef at both locations to allow exit and entry to the water at low tide (high tide is easy off the beach). Don't forget to drop your reef shoes at your exit point. Hundreds of species of tropical fish can be seen, as well as many Green and Hawksbill turtles. Reef Sharks (harmless) and Manta Rays. You can also snorkel in the lagoon 2 hours either side of the high tide.
The old lighthouse still stands on the island, but it is no longer in use. The actual light comes from the unattractive light bulb on a steel tower right next to the original structure. A small cemetery, including the graves of the lighthouse keepers wife and daughter are nearby. The residences used by the light keepers are now converted into staff residences, and are inaccessible to visitors who take notice of the signs, but can be seen from the path, and from the air