i had a similar question a few weeks back, but was more interested in going to places that i could get to using public transport and cycling near Sydney (a convergence of hobbies
)
Taking a tent and a 80mm Bosma refractor overnight.
i came across the following webpage and the Murphy's Glen campsite seemed like a possible candidate.
http://www.visitnsw.com/Astronomy2009_p3487.aspx
just need some consistently clear skies for a while, so we can try it out.
regards
Colin