I agree with kicman and PANDL.
If you come back another time for more time, you'll want to hit Placencia on the southern coast of Belize. And make a trip to the mountains & jungle on the western side of Belize. You can go tubing down the river, or in a cave, and/or go horseback riding. I recommend Black Rock Jungle Lodge, my personal favorite. Just walk across the street from the BZC International airport and rent a SUV. Get a good map and make sure you reach your designation before dark, as there aren't many street lights and it gets REALLY, REALLY DARK out there. Check out these websites: http://www.blackrocklodge.com/ http://www.belizex.com/san_ignacio.htm http://www.placencia.com/