Milang is a great spot to kite, and most submerged objects were removed when the lake was low. It is now full and I reckon that kiteboarders should enter next years Milang-Goolwa using race boards. The guys at the Milang Regatta Club can help you as well, if you call them.
http://www.sa.yachting.org.au/db/Clubdisplay.asp?ID=5018&Action=Display&MenuID=Clubs/10320/0&MenuID=Clubs%2F10320%2F0%2CCountry_Clubs%2F10323%2F0%2F