We spent the rest of the day at Wentworth Common. This is a park area that's part of the Olympic stadium complex at Homebush. We drove past the Bicentennial Park playground first, but it was heaving, so we continued until we found the Common, and there we had the whole wonderful adventure playground practially to ourselves.
There was a great sandpit which had taps and a wet area where you could play streams / rivers / dam-bursting-and-drowning-all-the-poor-sleeping-people.
And a we climbed the hill (called the Bay Marker) -