Hi there, I recently took a catamaran ride our to Dunns River from the Riu hotel in Ochor Rios. ABout 20 mins in, we stopped to snorkle for about half an hour, and then it probably took another 30 minutes to get to Dunns River from there. Unfortunately I would probably call the waters wavy. Especially when you sail back. I get quite sea sick myself, however I took 1 Bonamine (??) before I left and one on the way back and was fine. Fortunately, each stretch of the ride wasn't that long. Even on on the way back, wasn't more than an hour. Our tour was set up on the beach @ the hotel.