1) Aquarium
The aquarium was really cool because they have tanks that you can basically walk through via tunnels. Apparently, Australia has the smallest penguins in the world, nurse sharks are almost extinct even though they only eat fish, and platypuses look like drift wood (aka it didn't come out and I have yet to see one).
Video of jellyfish (please ignore the fact that I forgot videos can only be taken horizontally):
2) Opera House
Although I plan to go to a show or two at the Opera House, I took a tour just to see as much as possible. Pavaretti wasn't a fan of the purple carpet, the largest organ in the world (with something like 10,000 pipes) is in the Concert Hall, and Jorn Utson (the architect) has never seen the finished building.
This is in the Utzon room; though it looks like a painting, the close-up should show you that it's actually a tapestry:
3) General City Sites
I walked across the harbour bridge and took a bunch of pictures.
All my pictures can be found on my flickr account: www.flickr.com/people/pass_away13