Elliot Heads is definately the pick of kiting spots. The river mouth offers a mix of flat and wave (chop) with a low sand island to setup on. Works the best in a ENE to SE as anything more northly tends to get a bit dirty from the headland. Take a couple of different sized kites as the wind can vary quite dramatically.
There's a great camping ground (cabins if you're feeling fancy) with million dollar views + fish and chip shop.