G'day Al,
One site is Waterfall Oval at the Entrance of the Royal National Park in Sutherland ~ 45mins from city.
Its currently out of commission due to some key issues with the gates, but thats where the Sutherland Astro Society have viewing sessions. Visit the website
www.sasi.net.au
I'm a member, but admittedly haven't been there for a while. I'm sure if you drop them an email, you'd be welcome to come along. Its generally for members, but I'm sure they don't mind just to try it out.
Norm