I live in the North Shore area...on occassion I make it up to the Pony Club and it is always a worthwhile trip viewing is darker than my backyard and the company is almost always great.
I believe that the NSAS (Northern Sydney Astronomical Society) do some viewing at the Turramurra Golf Club on occassion...although I am a member, I've not attended an evening viewing there yet (I will someday). You can check out their website and get the contact information.
Clear Dark Skies to you!
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