Camping spots with a flushing dunny

I'm after some location within about 3 hours from Adelaide, preferably nth. Not caravan parks but somewhere you can book for a group of about 10-20, half of these would be kids around 7.
The loo would need to be within walking distance off the camp, and we want a fire.
We are looking at the oct. long weekend, hence the need to book.
My choice would be one of the many stations who are now into tourism, but the majority are not seasoned campers and they want to be able to flush.
Is there such a mythical place.
Dean