I went cave tubing with SEArious and highly recommend them. Willie is great. We went to the Belize Zoo and actually then had to go to a different cave system than originally planned due to the heavy rains beforehand but it was a great adventure. As for photos it was a bit too dark I thought to take photographs except for a couple places so I guess that depends on your camera or your luck ; ).
Take extra clothes with you and remember to not hold your mouth open too much as you ooh and awe cuz you never know where the bats might be and poop