It is rather difficult not to like Australian people. Their culture is very Western (U.S.) oriented yet there are some specifics that characterizes and separates the Australian people from other nations.
Australian people are very open to the cultural and ethnic diversity, and as a foreign visitor you will be warmly greeted by the locals. Since it is a country where lots of people from all over the world arrive not only to do some trips and travel but also to work, create a family and eventually stay there, tolerance among Australian people has always played a major role. They are aware of the cultural mix and it is well respected by majority of Australians.
Australians do not like to be loud and they do not express their emotions to a person they know only for a little time. But as they consider themselves to be friendly, they expect others to act the same too. Australian people are also rather proud about their country so you might hear them talking about it a lot. The thing that you should get used to is the specific sense of humor they have. Some foreigners sometimes are almost offended by something that an Australian actually meant as a small and insignificant joke. Just prepare yourself and know that this just is something you have to deal with every day.
It is actually difficult to generalize Australian people, yet once you meet some, you will see yourself their great positivism and attitude towards each other despite cultural differences that might occur.