Open water swimming. Easily.
Read this.
I'm a big ocean guy. Really, I am. Fishing is fun, cruising around is fun, even the beach can be a little fun, but swimming through schools of stinging jelly-fish = not a good time.
Some chick lost her goggles and hand to cling on to a buoy in order for a person on a jet-ski to bring her another pair. That sounds like a sick time.
