I know winter is over now but it likely will be winter again by the time I get back to Australia.
I also know there are a few temporary outdoor ice skating rinks but I do not know if there is any non artificial place such as a lake that freezes over in Australia in the winter.
Obviously it could't happen in any of the cities but what about up in any of the destinations where there are ski resorts like Bulla, Hotham, etc? What about as a specific adventure to whatever is the highest altitude lake in the country?