check out: http://AmbergrisCaye.com/tanisha/lamanai.html
its my favorite jungle trip...
see orchids, a billion kinds of birds, the Maya ruins, huge bromeliads, a nice walk through the rain forest, huge trees, vines you can climb to 60 feet or more if you feel up to it! (When you get down it looks like you jumped into a pile of sawdust from the fine dust on the vines)
great full day trip up jungle rivers and rain forests, topped by Lamanai, the Maya ruins.