When I first heard about snorkeling in the dark I said NO WAY! but our hotel concierge at the Marriott said this was a must do in your lifetime experience. The manager showed us her video and we booked it immediately. The staff is amazing and literally do all the work. We swam a short distance to the sturdy raft, put pool noodles under our feet to float, hung onto the PVC pipes on the raft an watched the most amazing show by these beautiful Manta Rays. At one point there were four at the same time, swooping gracefully in front of us and feeding on the plankton. There were also so many needle fish feeding right in front of us due to all the lights. This is a MUST SEE, MUST DO!!! We will definitely do again on a future trip to the Big Island!