It is very unlikley the country of Belize will ever give an outsider a tour guide license, which you would need to take anyone on your boat for any reason.Or for you to take tourist out on boats owned by Belizeans. It wont happen because the country of Belize holds these positions for Belizeans only, as it should be, If you own your boat you can get a captains license but you have to be a Belize resident with documents. Then you can hire Belizeans to run your boat.