Off of a crazy cheap airfare posted in this subreddit, my girlfriend and I are going to Australia on a whim in just over a month. Were planning on renting a car with camping capabilities and doing quite a bit of driving as it is, were flying into Sydney and at the very least getting ourselves over to Adelaide as I have some family there. Other things we were contemplating doing/seeing:

-Blue Mountains National Park

-Nightcap National Park/Byron Bay

-Mungo National Park

-Ocean Road

-Royal Gardens/Healesville Sanctuary/Dandenong Ranges in Melbourne

–Tasmania (Cradle Mountains/Wineglass Bay/Hobart)

Other possibly relevant information is we are both American, from Arizona, and both 20 years old. Dont mind a lot of driving, just want to figure out whats the best to see on a first trip and how much we can reasonably do.