On my 3rd day in Oz we went with a bus from Syd to Melbourne via Canberra.
We had 8 hours in Canberra which was a decent amount. we saw war memorials and went to Questacon, which is a really nice museum. with lots of activities and stuff to learn, but probably that's enought time to spent in Canberra. However the memorials and Lakes, Parks are mind-blowing.
Then we kept on travelling in the bus, had to stop in Geraldton at 1 am and also had to hop into another bus. For Christ sake, I hated the bus tour.