West Head is a great spot - I think its one of the best kept secrets in Sydney.
The road to West Head is generally locked at night.
The road around Akuna Bay is a bit poor, patchy, bumpy and often has bicycle riders. At night be careful of wildlife - had a kangaroo hit a car in a convoy I was taking through there.
But it is pretty cool to be out in the middle of nowhere and yet still be in Sydney.