I would recommend a sticker that BOTH wind surfers and kite boarders would want to use... so there is a tie between the two groups, even if it's just a sticker. Something more generic with a picture of both a wind surfer and a kite boarder.

"Wind Powered"
"If it's blowing I'm going"
"Knot working"
"Riding the Wind"
"Florida Wind Boarder"
"Just Blow Me" (sort of kidding with this one)

Not the best examples but hey I tried!