lotsa folks can get you to the cave tours from San Pedro, check the guides page at http://ambergriscaye.com/tours/
its lotsa fun. http://ambergriscaye.com/pages/photos/750.html
go thru the next few pages, there is another sequence in there toohttp://ambergriscaye.com/pages/photos/546.htmlboth those sets of pics have several pages of photos go hit the NEXT buttom on them several times...
i myself prefer to swim. most prefer the tubes. there is a great tour at caves branch where you go up the river sometimes swimming, sometimes walking. there are like 6 i think waterfalls of over 10-15 feet you climb up in the cave. you can dive off them to the pools below with helmet and light on it. lite still works when you bob up!!! i love swimming in big pools with everyones light off.
incredible down there. amazing formations, bats, lil crayfish and small fish in the water. some have crystalized skeletons that are very old.
Here's me at Actun Tunichil Muknalhttp://belizephotographs.com/070714.html
Here's one entrance to that cavehttp://belizephotographs.com/070515.html