Absolutely awe-inspiring phenomenon to experience. Loved the small group, very knowledgeable staff and guide in the water. The large groups were very noisy, our group was very calm and the mantas seemed to like that because we saw at least half a dozen unique rays, who hung out for the entire time we were in the water. They came so close that they appeared to be on a collision course. Amazing tour, 10/5 stars, and the tour guides all impressed upon us the importance of respecting and protecting the wildlife. Thanks!