G,Day Shager .
Nothing like getting the youngun's started camping from the get go, For the camp areas that would have grass, I would say Dilly Village, from memory its fenced, gives good access to the beach .....Lake Boomingen has a fenced compound that you can camp in, you have to carry everything in by hand into the compound , from memory the same thing at Central station too if your tenting it ..
Waddy point and Dundaburra are fenced too, though the sites arnt what you would call grassy .
Dundaburra has a large grassed area for group bookings that I know of..
Other than that take a good netting to put over the little ones bassinet to stop the march flies getting at the little one .