I highly recommend a bike ride to the north side. You get the world famous hand ferry ride and some exercise as well. We rode our bikes to Journeys End and then walked to Mata Chica. A few bugs between JE and MC so bring a little juice. We stopped at the Sundiver for a beer and just had a great afternoon. Lots of other places to explore as well. Caye Caulker is an interesting visit and you can get there fairly cheap. You might want to buy the San Pedro Cool
book by Lan Sluder. You'll see his posts on this website every so often. Enjoy