Sydney Aquarium was the most interesting I have ever been to. A rare opportunity to see sharks and lethal jellyfish in their habitat without being noticed.
For those who visit Sydney, a whole Day dedicated to the TARONGA ZOO is a must. It is a huge theme park, with a privileged view to the Opera House and Harbour Bridge. Besides being close to native Australian animals, you can walk in the areas for foreign animals. It is a pleasant, interesting and fun place. Some animals, like the chimpanzee babies, make us laugh or get emotional.
When I was in Sydney, I got surprised by how many marriages I have seen on a Saturday. While walking around the city I saw at least 8 couples with bridal attire.