I didn't use a wetsuit but I would think that you could ask for the thicker life vest (which is like one that you'd wear to go water skiing) when you pick up your wetsuit. You'll see it displayed on the wall behind the counter. The thinner, form-fitting life vests are located by the lockers. I would think that you could wear the life vest then if it's uncomfortable or not recommended by the trainers then you could take it off & leave it on shore. The distance from the shore to where you stand on a ledge interacting w/ the dolphin before the swim is only a matter of a few feet. Maybe you could bring both vests just in case. They seemed to have enough to go around.