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Suggest you try contacting Mystic Man. We were on a catamaran last week with them. There were only 9 of us (min 8 required) and we went whale watching, snorkeled at a marine reserve for some of the best snorkeling ever, had great views of the Pitons, and toured Marigot Bay on the way back to port. There was an option to visit the black sand beach at the snorkel site, but we chose to snorkel for the entire time as it was incredible!Based on their website that is the Cruise Ship Eco Adventure and it sounds really nice! Thanks for posting this
We did the eco tour for $70 per person.