We went cave tubing with Reggie when in Belize on the Paradise. We made a reservation online, thru his website, but we paid in cash when we met up with him in Belize.
His website is www.**********
He was $60/pp when we went with him. We stopped at a restaurant on the way back to the ship, the caves are about an hour ride away from the ship, and if you wanted to eat it was extra. The food was great and trust me you will want to eat, we were all starving.
He has never missed the ship before and uses the same cave system that the Carnival excursion uses but you go thru one more cave then they do.