I just got back from a Western Carribean cruise on the Inspiration. We booked the Sting Ray excursion through Soto's Cruises. It was $24/pp and we had a great time. We did two snorkel sites and then the Sting Ray sandbar. Took about 2½ hours. In Cozumel we went to Chankanaab Park which was just beautiful. I did write a review which included our shore excursions if you want to take a look. It's under Carnival Inspiration.