I did the Manta Ray Night Dive off Kona in October 2009. I did the SCUBA version while my husband Steve and Dean did the snorkel version. It was far and away the most spectacular wildlife viewing dive I've ever done. The dive master sets a large light on the sea floor; the divers sit in a circle around it with flashlights pointing upward, the snorkelers form a circle at the surface with flashlights pointing down. It wasn't long before the Manta Rays were attracted to the light, and it seemed to be their habit to show up for the free salad bar. They were regulars, and the dive master could identify individuals by the spots on their undersides. Eventually more than a dozen of them swooped in, looping upward in the column of light, they are gentle, giant creatures, many of them measuring 12 feet across, with their huge mouths perpetually open as they filter feed. Get eye to eye with a manta ray, the experience will leave a lasting impression!