This was a 5 hour cruise on a catamaran to the Na Pali Coast including a deep ocean snorkeling adventure and lunch. We snorkeled in 30-40 feet deep water and saw the bottom clearly. I can't swim so I put on a life jacket plus a floaty around my waist. I may have looked funny but I didn't care and off I went into the water holding onto my life jacket with dear life with both hands. The last 90 minutes were bad on me: I got motion sickness from constant movement of the boat.