Unless you have some friends at ANU, I can't imagine it'd be that fun.
There's heaps of stuff on - but its nothing like the amazing amount of fun had at colleges (getting trashed 4 nights in a row with 150 of ur new best friends)
look, it is possible to have a blast if you put some effort into it. ANUSa runs plenty of social events, and many other clubs and societies run events of their own as well. dig around a bit and you'll find open-access events that will suit you.