simple (Score 1)

Jet-Skiing :) I had my first run yesterday (muscles are still sore). It is surprisingly hard work... I am not at all unfit, actually quiet the opposite.

You don't feel it at the time, but today I do :) The best part is it is great fun with a partner - and even better in a group. The water temp was only about 20 degrees (Celsius) - but with a wet-suit on it might as well have been summer.
Winter is coming up for us now, but I still plan to go down then (even when it is only 12 degrees...).