You will not see wildlife everywhere, nor is everything deadly
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 preferable to visit a wildlife park to witness these local species. While we're on the subject of animals, not everything you see is harmful, and even if you do come into contact with a more dangerous critter, it's doubtful they'll kill you. Australia has a lovely natural setting full of gorgeous – and frequently unusual – species, many of which may be quite hazardous, but this country is not a death trap; you will be OK.
Wildlife may be found all around Australia. If you want to view some of the spectacular species up close, you should drive further inland. There are several excursions available, and your guide will be able to educate you on some of the natural environments in which they dwell, as well as the history of the region. It is one of the things about Australia you should know before traveling.