Hi Martyn,
By all means go check it out but I suspect that site might be locked out after sunset. You could possibly contact the ranger to arrange access, it has been done before.
However there is an easier solution - turn up at the Northern Sydney Astro Society's observing nights at North Turramurra Golf Course, check their website to confirm whether it's on of off (weather) before leaving home.
Having tried it 2 night ago for the first time I can confirm it is about as good as it gets, short of going to the Blue Mountains. You can just see the Milky Way. Limiting visual magnitude is about 3.5-4. Altitude is 181 metres, the seeing can be quite good and it's in a car park, well off Bobbin Head rd so lights aren't a problem. Best of all you'll have some like minded company and no hoons to bother you.
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