When I was in school we had a class trio to Belize. The reefs and walls off of Lighthouse Atoll were amazing. We stayed on Half Moon Caye and had a great time. If you get a chance to dive the Blue Hole, it is worth a dive to be able to say you have been there and get to see some of the sharks that hang out in the middle. Inland... the zoo is worth a visit, as are the Cockscomb Jaguar Preserve, and some of the other towns such as Placencia, San Miguel, Punta Gorda, and Clarissa Falls was also nice. Depending on where you are staying, most probably on Ambergris, alot of things may be out of reach. Great place though I cant wait to go back