Lamanai is by far the best day trip, but it definitely an ALL DAY trip. A comfortable day trip is Xunantunich -- less stressful and easily combined with cave tubing for a fun but not too full day. You could easily rent a car and get to Xunantunich and tubing on your own -- the western highway is pretty easy to navigate, but I would recommend a worry free trip that includes everything from san Pedro, transportation, entrance fees, and lunch.

I will have a Belikin -- put it on klcman's tab.