Doesn't the bus to Gordon arrive every 90 mins or something ridiculous like that.
For the original poster: it'd probably be cheapest getting return student ticket daily and a blue student travel ten. I used to do that when I lived in West Ryde.
This is what's happenin for O-Week at the following unis:
Club Mac: http://www.sam.org.au/DisplayPage.asp?pageid=3870
UNSW: http://www.union.unsw.edu.au/oweek/whatson.asp
USYD: http://www.oweek.com.au