Hi bigpapa, welcome to Cruise-Chat. We have not done deep sea fishing in St. Maarten, just snorkeling. But I did want to welcome you on board. Did you try googling it? I found about 218,000 hits when I typed in "deep sea fishing St. Maarten". Hopefully, someone on the board has been deep sea fishing there and will see your post. I can tell you from snorkeling, there are big fish there
Best wishes for a wonderful cruise, and once again, welcome aboard!