Hi,
There is an oval at Old Illawarra Rd and Throsby Cl Barden Ridge, near Lucas Heights, which is on a high spot with somewhat darker skies around 3/4 of the view, even though still in suburbia.
As with all these places I would not go there alone.
For a good half sky view any of the parks etc right on the Sydney coastline will give you a darker sky to the East.
Cheers
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