sturt valley drive is awesome (couple of full on hairpins and is twisty n hilly, infact the whole area is sick) MAP
main road between clarendon m blackwood (has it all, sweeping bends, tight corners, on and off camber) MAP
eagle on the hill (somewhat abandoned due to the new freeway, decent surface) MAP
chain of ponds - MAP
heaps more around... (some wont be mentioned... they are like fishing/surf spots )
EDIT - added maps