On our last full day in Sydney, we checked out Darling Harbor and then went to the National Maritime Museum. It was quite affordable for the exhibit-only ticket (not the ships outside or the special exhibit): $3.50 for students. The museum had a lot of stuff -- odds and ends of ship things plus the military aspects. I especially liked the section on stories from ship passengers who arrived in Australia as kids. There was even a Big Brother Australia program to get young boys from Britain here to work on the farms. And the White Australia policy wasn’t officially over until the 1970s.
Next we went to see Jurassic World for the second time, but this time in the "world's biggest IMAX screen". The theater was very poorly organized and managed, with masses of people and no crowd control, and they started late. But we still enjoyed the IMAX experience!