Featherdale Wilderness Park is like a zoo in that it's a park with some animals in enclosures and some animals that are able to roam more freely. The location is about 45 minutes northwest out of Sydney, so you'd need to get there via car or tourist shuttle. It's a quite inconvenient getting there by public transit.
The entrance fee was $32 in Aussie dollars (discounts available for students, children, seniors). If you want a professional photo taken with a koala, it's $25 per session (they'll also take extra photos on your phone if you want them). The photos the park takes are printed instantly: 1 large photo + 2 smaller photos + digital copies online, so I felt like it was super worth it. Lastly, you can feed some of the animals (like kangaroos) by purchasing a cup of food for $2. We probably spent a totally of 2.5-3 hours there, which felt really worth it for us, especially most of the animals were Australian animals I'd never see otherwise.
For the Koala photos, I'd recommend checking in as soon as you get in the park since the queue can get long. We lucked out since there was no one in the queue when we got there.
They also have a gift shop for souvenirs. :)
which animals did you see?
Most of the exotic Australian animals you'd think of, I got to see: