I know you were looking for something out of French side but I believe some of the recommendations were also from Dutch side. Went on Random Wind out of Skip Jacks marina in Simpson Bay next to draw bridge. Had a great time. (see review in Trip Advisor Sandy 322) Friends went 2 weeks later and also loved it. It goes out 10 AM and returns at 3PM.
https://www.tripadvisor.com/Attraction_R..._St_Martin.html