Where to see in Australia

[blindswelledrat]

Im planning a family holiday in a year or so to Australia and want to pick peoples brains.
We have been a couple of times before and have seen Sydney, Melbourne, Barrier Reef etc but non of the rest of the country.
What is worth doing?
Particularly fancied some kind of winnebego road trip type thing.
ANy suggestions?
Also fancied Ayer rock but it seems in the middle of nowhere. Might we just as well fly in and out in a day?

[blindswelledrat]

Ive been to a lot of that HR (including that crocodile park. It was st but we loved it too)
Im not thinking of day trips and specific things to do, but more other parts of Australia we haven't seen.
eg: Is there much in the north and west coasts?
How do you get to ayers rock