It would be worth talking to the guy from KSS. I don't see why this wouldn't be in his best interst.
Pamphlet's could be a simple way.
A large sign at the beach, but that would involve the council.
KBV, try it, I'm not getting any responses from them.
Update the KBV website with better kite location info.
KBV to send out regular newsletters with that sort of info included, i.e. hazards, accidents.
...or de we need to create an altona kitesurf club to push that through ->transform MAKO.