Wildlife is not seen everywhere
The expectations and ambitions of seeing kangaroos and koalas wandering the streets are unrealistic; with towns rapidly increasing, wildlife has moved inland, and it is best to visit a wildlife park to witness these local species.
While we're on the subject of animals, keep in mind that not everything you see is harmful, and even if you do come across anything more dangerous, it's unlikely that it will kill you. Although Australia has a lovely natural setting full of gorgeous – and frequently unusual – critters, many of which are hazardous, this country is not a death trap, and you will be OK.