The council caravan park. head all the way in and turn left. Look for the boat ramp (the beach one not the creek one)

$17 per night for whole campsite. Hot showers.
Here's a tip...camp a bit away from the ramp parking area. If it's calm you will get a shedload of boat launching tractors buzzing you from 5am. Best to slightly more in the middle of the area under the big trees.