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I agree with Camelia......I've only been to Orient Beach and I don't think it's known for snorkeling.I've never been there, but have heard about Reserve Sous-Marine Regionale, an area off the northeastern shore of French St Marten that's a protected regional underwater nature reserve. It's supposed to have calm waters, shallow reefs and coves and great snorkeling. Maybe do a search for that online and see what you find. I've also heard of Baie Rouge, on the French side, that has a long stretch of sand nd rock formations that are cool to snorkel. If you for sure want to snorkel St Marten, I'd do a search on some of these places and others, then just hook-up with a taxi to take you and pick you up. Have fun!