Hustler Eco Tours has a wonderful all day sailing trip on their catamaran with snorkeling at Hol Chan and Shark Ray Alley. They take you to Caye Caulker where you are on your own for lunch anywhere. Then rum punch and Belikin Beer all the way home. A great day!
Everette Anderson has a boat that is liscensed for 14 but he would take you as a private party. Snorkel the above then go back to the shell beach for a beach bar-b-q. The beach is covered, ankle deep, in shells. YOu can pick them up by the handfull or carefully select only the perfect ones you want.