CSU claims that everyday is open day.
Ring them up (look on the website for a number) and explain who you are and what you are planning to do, and they should be able to work out a time that is good with both you and them for you to come along and have a look around.
Apparently Dubbo campus is REALLY small (like, 300 students I think the guy said)... I would promote Wagga. I don't go to Uni, but I have heaps of good friends who go to CSU Wagga, and love it. I love going out to the Uni to socialise too. It is a rather social community out there.
Just be careful at the moment, especially on Pine Gully Road. Apparently the police are having a major crackdown on P-platers for anything they are doing wrong. Especially turning left out of Pine Gully rd onto Old Narrandra rd and not stopping at the stop sign.