I went on the Inspiration to Grand Cayman, should be the same tours. There are 3 stingray tours. They only go to the sand bar, no reefs. You really only spend about an hour on the sand bar, but I found that to be enough time to swim, feed, play with the rays. We took the cockatoo Catamaran tour it's 49.00 for 2 1/2 hrs. with only about 40 people on board. It was great. Great crew!!! The other tours are a triple decker cat. for 39.00 2 1/2 hr with 150 people, looked like there was plenty of room on it. Stingray City tour 39.00 40 people on yacht also 2 1/2 hrs. I have heard great things about Captain Marvin. The draw back from taking a tour not offered by the cruise line is you might run late and miss the boat. Hope this has helped you. Any ?'s I'll check back later. Have a great cruise.