I just want to let you know that the cave/river float in Honduras is good, but if you are looking for excitement, they have awesome ziplining. If you are doing a western carribean and looking for cave tubing, Belize has a really great spot for that! Have fun!
We took a Lamanai excursion in Belize that was great - the water taxi ride to and from the ruins was fun in and of itself. I liked that the ruins were basically in the middle of the jungle and not overrun with tourists, just a few small groups. You can climb to the top of the main temple - DD did that, I stayed at the bottom and took pictures of her LOL