The biggest difference between Australia and most other parts of the world (that I've seen) is the relationship humans have with the wildlife here and visa-versa.
It's Garden of Eden'ish. And shocking and wonderful to most Americans or Europeans, though normal here.
Wildlife stays away from humans no differently than any other animal it doesn't know yet. And where there have been long term, beneficial relationships, there is a trust, bond and even mutually beneficial exchange with local wildlife.
In the Great Barrier Reef, huge fish come by and let you pet them. On the beaches, dolphins play with surfers (and sometimes help chase away sharks for them). Kookaburras will let you feed them and take care of your mice, too. And the wildlife are intelligent, playful and emotional in very human-like ways.
It's something to experience to really understand and believe. And nobody ever leaves here the same.
It changed my relationship to nature forever in the best way.