Check with Anne of Marina Jack. Her e-mail is: banquets@MarinaJacks.com
Also check with Sarah of LeBarge Tropical Cruises. Her e-mail is:LeBargeTropicalCruises@msn.com
They can tell you the cost for chartering their boats and give you an idea of food costs.
I don’t know if their Captains will officiate your wedding or if you’d need to bring aboard an officiant.