Hi Michele! I have done the Spirit of St. Christopher snorkel tour...it's a nice snorkel excursion. You motor or sail over to Buck Island (depending on winds) where they anchor and you can snorkel off the boat. It's a pretty short afternoon excursion and nice to do if you want to use the morning to shop in St. Thomas.
The boat is a good-sized catamaran and the crew was friendly. They serve you water or punch (with or without rum) on the way back.
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