My hubby and I did Snuba in Cozumel this past February on our first cruise ( NCL). I loved it and so did he. We were the only ones in the group and got somewhat of a private lesson from our guide. We got used to breathing with only our mouths first as we were standing in waist deep water. I went down and had no problems except my throat got extremely dry from the air and once when I looked at how deep we were I kind of panicked and swam up to hang on to the raft that holds the airtank. Our guide came up to make sure I was ok...he was wonderful! Just as I was getting the hang of it and got my camera to work, the tour was over (about 25 mins) We asked him how much to go again and we paid cash $35.00 for a second tank of air and went around again. I am not sure if it was the swallowing air or the ocean waves, but all of a sudden , hubby and I started feeling nauseaus. We were finished and went in. We thought once would have been enough if we had fully had the hang of it. It was a wonderful experience for both of us. We saw a seahorse up close and a stingray. Many fish and beaurtiful coral. It is an experience I will never forget. Being right there next to all the fish is just like being in a different world. I highly recommend it. Next time I would book on my own instead of with the ship. It was much cheaper!!! Have fun! Melissa