You have several options among companies that will take you out to snorkel with the Manta Rays on the Big Island of Hawaii. Manta Adventures is the best operation of the bunch. The boat is new and clean, the captain and crew are professional, the snorkeling gear is high quality and sanitary, and they leave a bit earlier than the other excursions so they get the best spot to view the Manta Rays. All the companies will say they are the best, but once we got out there on the water and saw for ourselves what the other boats and their equipment look like, it was pretty obvious that Manta Adventures operates at a higher level than all the others. We had an experience that we will never forget and from beginning to end, Manta Adventures exceeded our expectations. Well worth the money.