Snorkeling & Diving with Manta Ray is one of the greatest, if not greatest, experience in Hawaii. You swim in the blue sea and with these giant, lovely, beautiful Manta Rays coming and dancing around you, really really close. It is truly breathtaking.
During busy seasons, most companies pack their boat with dozens of guests, while Capitan Ron is said to take no more than 6 people. We went on the Thanksgiving night and he and his swimmer took only my wife and me: it is like a chartered boat for us.
Since we were the only guess, we got exclusive service from the swimmer (sorry, I forgot her name). She leads us to the spectacular view spot and always points us to the rays that coming to us using her diving light, so we knew where to look.
A bonus of the trip is that a professional video photographer hitch-hiked our boat right before we left. Since we share a boat, she took a exclusive video for us without dozes of other snorkelers on the background, only me, my wife, and Manta Rays. Of course, we have to buy the video, but we were like having a chartered boat with a private photographer.
The Manta Ray trip with Capitan Ron was indeed our best experience in Hawaii trip, out ranks the helicopter trip :P