It depends what uni you want to go to as they offer different bonus points for different things
There's HSCplus (UNSW) and flexible entry (usyd), and whatever every other university calls it which gives you bonus points if you get a particular mark in a subject or a combination of subjects
Many uni's have something like an Elite athlete and performers program which CAN reward you for things such as sport, music, co curricular
If you live in a particular area, then some unis give bonus points for that
There's the Educational Access Scheme (EAS) which gives you bonus points if you're disadvantaged in someway (this is done through uac i think)
You should look for bonus points yourself as I'm not sure what uni you're thinking about attending
Just search "(name of uni) bonus points" or something similar into google and there will probably be a page about bonus points