Hi Guys,
We endure this problem daily and more annoyingly from the jet skis. Just take their rego number and phone the water police and request they notify the DPI.
They can do nothing unless you have a rego number and a boat/ski description. We complained about a ski who was towing a sea biscuit through the kiters a week ago and I got a call from DPI who rang the guy and sorted them out. They were there agin yesterday but operating within guidelines.

The yellow bouys between Mullas and Pinnas indicate the water ski zone where jet skis and such are allowed to legally tow skiers and biscuits etc. All other areas are restricted to 8 knots within 200m of the beach. There is a pdf downloadable document from DPI which displayes all of the restricted and zoned areas around Pinnas.
There is currently no registered "Kiteboarding Zone" at present so we have no official rights any more than any other water user.
To get really technical and black and white, kitesurfers and windsurfers are categorized as "sailing vessels" and as such must conform to DPI regulations.
Quote from DPI document;
Prevention of Collisions"Wind surfers and kitesurfers are classed as sailing vessels and also have obligations under the
international Rules for Prevention of Collision at Sea to operate at a safe speed for the prevailing conditions and circumstances and take appropriate action to avoid collisions."
Safety equipment"Wind surfers and Kitesurfers operating more than 400m from shore must be equipped with PFD Type 1 and an inshore distress flare kit"
I hope this clarifys things a bit and brings some understanding on both sides.
Cheers and good winds,