once you're out it doesn't matter what tune sticks in your mind
they're all good.
i must confess that one time (my tape didn't work so i had to listen to the radio) a britney spears song got stuck and was hammering in my head the whole session. but it didn't matter.
if you get something more spicy (i.e. hardcore, crossover, metal), it'll get your style more agressive, if you got reggea, you're riding more easy ...
it'll be cool to have a mp3-player (saw a mp3-cd player really cheap the other day) with you - so you can record your personal kiteboarding-cd with pushing tracks and calming ones
what about these waterproof ags you see for cellphones etc. ?
if you get one that's big enough, you just need waterproof headphones and an idea how to connect them.
but safety first!
if you hammer around, your ears sealed with the newest tunes of your favourite band freshly illegal downloadet and your buddy's calling for halp behind ya, he'll not apreciate it that you're enjoying this luxury!