I know this is late for you, just posting it in case someone reads this looking for information. We were on a cruise last week booked a dive excursion in Grand Cayman with the cruise ship, we both pretty close to where the cruise ships were, it was ok nothing much to see. In Cozumel we booked a dive trip with Aldora.com on the recommendation of our dive instructor. Our dive in Cozumel was great, a short taxi ride to their office and we were signed in ready to go. It was just my wife, Daughter and myself on the boat with the guide, dive master and captain. Also with them my wife and daughter dove with LP steel 100’s I had a LP steel 120, not the usual AL80’s so we had plenty of bottom time. We had such a great time with them we are planning to fly down later this year.