This was truly a once in a lifetime experience! I will say it was a bit physically demanding trying to hang onto the board and video at the same time in the rough ocean, even though you really are just floating. However there was never a point where I felt unsafe, the guides offered help to people going to and from the boat that needed it. They were very informative through the experience. The Mantas were HUGE, and we saw so many!! Some even come close enough to brush up against you. If you go to the big island, this is a must do experience!