Burrinjuck Waters State Park.
It's a caravan park but the camping is fairly open form. Good clean toilets/showers, kiosk with fuel, ice, tackle, booze, food, etc. Water level is likely to remain high again this summer. On the downside, lake can be prone to algae.
Kids can feed kangaroos and birds, fishing, swimming, etc. Family Favourite. The cabins are pretty cheap if you don't want to camp, but need to be booked well n advance.