I go sailing. I know it sounds boring boring and repetitive (which seems to be the view of just about everyone who doesn't sail), but there is nothing more exhilarating than screaming down massive waves at 30km/h with spray flying everywhere, right on the edge of control, aware right at the back of your mind that one wrong move is going to send everything tits up very hard, very fast and very painfully. The fact that all this is achieved purely from the wind just makes it even better. It's an absolutely fantastic feeling, reduces me to squealing and laughing like a 5 year old every single time.