In Australia, there's a flavor of the Ironman Triathlon that's essentially a lifeguarding skills competition. Given that nation's love of the beach, it's fairly popular featuring ski-paddling, boarding, swimming, and beach-running.
It also features nudity, at least when that last event takes place on a nude beach, as it did this past weekend in Perth. Spectators in the altogether were able to watch a 3.6km portion of the race, which I'm sure just added to the scenery. [TEN TV Australia]