St. Mart. is fine for renting a car or jeep. I don't think u need to be overly concerned with safety issues.
We've done a private sail and snorkel out of St. Thomas to Buck Island that was wonderful!! We booked ours through www.portpromotions.com
We had our own sail boat with a captain, and first mate. At Buck Island the mate became the underwater guide. He brought tidbits along to feed/attract the fish.
Had a GREAT day!
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