hi there,
The island of St Martin is surrounded on all sides by beautiful and unique coral reefs and he most common things you will see underwater on your St Martin snorkel experience are surgeonfish, parrotfish, and grunts.
However, on the south or east side of the island,
snorkeling in St Maarten will allow you to view such marine life as hawksbill, leatherback, green turtles, and more.
Also, St Martin
snorkeling encompasses shoreline or boat snorkeling excursions with a large variety of unique marine life to explore so it's worth looking into that.