Sounds like quite the Gilligan's Island adventure, hopefully w/o the tragic aspects
While daytripping on Caye Caulker in July I saw one of the tour operator's signs that advertised a sailing trip, 3 or 4 days I think? Get on a sailboat, sail to Tobacco Caye, camp overnight, sail again to another Caye, same again, camp, debark in Placencia. Trip included boat captain, camping gear, & food; all I'd need would be some friends, my guitar, and plenty of rum. Very intriuging...
Be sure to post a report here on your temporary exile on a tropical isle