This is a beautiful walk, very lush and green, there is a ascent up the hill, the gradient is relatively gentle though. If you would like to do it as a car shuffle, here is the the place on Hue Hue Road to leave a car: Google Maps Link.
Start, Parkridge Drive, walk up Parkridge Fire Trail: -33.225450556677636, 151.39817833900455 Google Maps Link
Turn right onto Parkridge Fire Trail, then head left up the hill when you see the path there: -33.22646471412877, 151.39241695404056 Google Maps Link
Hooray, you have reached The Top of Mt Alison, head back down the hill, turning left at the picnic area: -33.233123756785695, 151.40125751495364 Google Maps Link
At the firetrail at the bottom of the hill turn right onto Francis Byrnes fire trail, keep left when it continues toHue Hue Rd: -33.23758377539121, 151.39765262603763 Google Maps Link
You've reached Hue Hue Rd: -33.23962974402257, 151.40130043029788 Google Maps Link