While not a typical snorkeling trip, the snorkeling experience in the Ruins tank at Atlantis is amazing. Its about an hour with 30 minutes spent snorkeling in the deep water aquarium tanks housing sharks, Manta Rays, Eagle Rays and everything in between. My teenage daughter like it so much she begged to do it a second time, which we did. You are allowed to bring your own underwater camera and we ended up with video if a 14 foot Manta Ray brushing up against us. Definitely a good time.