We took one one on the San San, a really luxurious boat/ship (50ft or bigger) -- had a great time, only problem was we were just tanked by 12:30pm on our return to the pier!!! Had a great time, snorkled, then got boozed up!!!! But it was a blast, nice boat, small group (10-15 folks). I think $50 or so. pp. WHATEVER YOU DO, HAVE A GREAT TIME !!!!!