To be honest with you all , the skies might not be as dark as your expecting.
I regulary go here because I dont like venturing to far out from the city by my self.
The skies are okay, as long as you have a nice big light bucket
Its about 1hrs drive from the city, 30mins from Manly.
Check it out here:
http://maps.google.com/maps?f=q&sour...=UTF8&t=h&z=16
But since ive found some keen sydney siders that are willing to meet up

, I am all ears to suggestions of a better place around the area
Cheers,
Ash