We rode the catamaran at CTI and the day we rode it the waves we pretty large. It was a lot of fun. We set on the front of the boat on the cargo net. I did not get sea sick at all but got really wet. Yet I did get sea sick on the scuba boat but felt better once I moved to the front of it. So maybe sitting in the front of the boat will help if you think you may get sea sick. Have fun.