Australia has 7 states and territories, much like the US/Canada's setup except our normally have less autonomy from Federal government. Every state at the moment is running a different set of laws and restrictions regarding covid. The common things are state borders are often closed now, many work sectors have mandates against working if you arent vaccinated, and states also have varying degrees of segregation between vaccinated and non vaccinated. For example in my state the unvaccinated can no longer go to a range of public venues, bars, restaurants, stadiums etc nor government buildings like museums and libraries, nor can we visit sick people in hospital. Mask mandates vary by state and council region( like your counties). ..Not sure who can fly in right now. Doubt you can get in unvaxxed, unless you are a celebrity with a great excuse. Prices can spike too. Had an American work mate here decide to go back home last year, it was 10k per seat for him and his wife. Without trimmings and positive slants by aussies with heads in the sand, it is essentially a police state, well 7 to be precise.