You have asked a very good question...not sure there is a good answer...
I use my backyard...not such a good spot.
The are a group that meets regularly about an hour (or so) outside of Sydney (see some of the other posts in Star parties and observing section about Kulnura... however it is spelled)...it is pretty good and always lots of good helpful IIS company...
The Northern Sydney Astronomical Society has viewing nights at the North Turramurra Golf Course. I've never been but you might try and contact them...
I'd be anxious to see what others suggest too.
Clear Skies...
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