I would suggest doing the cave tubing trip to the mainland with Seaduced. Its just a one day trip and ITS FANTASTIC! You leave by boat in the a.m. and travel up the river to the mainland, take a van into the countryside to a really nice resort (Jaguar Paw), eat lunch, and then off to the cave for a great, cool adventure. You then go on to the wonderful Belize Zoo. YOu get back home to the island by sundown! Plus, the caves are so beautiful and the short hike through the jungle is like being on another planet compared to the island. Best of both worlds at your doorstep in BELIZE.