I'm just writing this to clarify with the entries previously noted. Definitely do this! It's perfect in the summer time, flat as glass. If you are able to climb down 20ft of reef off the Sheraton Keauhou hotel, it brings you to 1 ft above the water where the mantas swim in the spot light 30 ft from shore! I can't jump off cliffs, 3-5ft scare me so...this was doable. Save money and go every night just in case you don't spot them the first night you are hanging out by the bar at the hotel. The people at the bar will be cheering you on and maybe think it's strange but they take pics and say how that was cool!