Race across Gustavia Harbor in an open-air boat for a snorkeling adventure that will be just as thrilling as the ride there. The captain will assess the weather and water conditions for the best spot to anchor, but chances are it will be just outside the harbor to maximize your snorkeling time. The waters there are crystal-clear and teeming with reef fish. You may spot brilliantly colored angelfish, large groupers and schools of queen triggerfish. One of the most curious-looking species is the four-eye butterflyfish, which is named for the two dark spots – or false eyes – on the sides of its tail, which are meant to confuse predators. You might also see green sea turtles gracefully swimming by and feeding on seagrass and algae on the reef. They are noteworthy as being the largest of all sea turtles and the only ones that are herbivores.