There were heaps of boats moored and hanging around all around iiriki last time i was there (2011 or 2012). Maybe it was just a busy time, yachties everywhere, some mega $$ boats and lots of kiwis.
Kakula island would be a good option as well.
I saw a few kiters near hideaway island. I think its Mele beach? Another lone kiter off some random beach in Tanna. Life's tough for him!
Close to brisbane, 84 islands, plenty of places rarely seen by man, wind, lots of fish with pointy noses, friendly locals, cant really go wrong