Make sure you get to Australia Zoo nice and early as there is a lot of cool stuff that the animals do earlier in the morning, and then later in the afternoon they sleep a lot. I think it opens gates at 09:00am.
we stayed with SIL when we went up in Nov last year. Australia Zoo is awesome and make sure you get to the main arena for the show.
We also went to the aquarium on the sunshine coast (I *think* it's in maloolabah but google is your freind here) and I personally thought it was better then the sydney aquarium, granted not as big but much better.
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