After doing the eastern side of the ridge, I figured I'd return to the beautiful Berowra Waters for an overnight day-length walk. Unfortunately the map from the Great North Walk info pack led me astray — their estimate of a day for this trek was wildly inflated. Starting at 1:30pm I did the loop in less than four hours, getting home in time to watch Australia steal a win against Wales in the first rugby international of the season. So yeah, it was pleasant taking the tent/sleeping bag/mat/cooking gear/... for a walk, but in this weather one could get by with just a litre or two of water.
I had in mind to head up past Berowra Waters on the Sunday, as the camping options are a bit limited north of that point, but it seemed pointless to pitch a tent at 5pm. The track itself is very well signposted and quite a bit runs along fire trails, allowing a decent pace. There is some up-hill just near Sam's Creek, but nothing too arduous.