Down the bottom of the gorge you could stop for a short bush walk in the gorge but most likely you will keep on going across the bridges and start the climb up to Galston. This is about a 3 or 4 km steady climb, which has one or two narrow spots, but it widens out towards the top.
At the top, Galston Rd turns left at a T-intersection (Crosslands Rd goes off to the right). Follow Galston Rd for another km to a roundabout in Galston. There are shops near here if you need some supplies, and a cafe in a nursery off to the left.
Turn right at the roundabout and follow Arcadia Rd. You can take a diversion into and through Fagan Park,(an old orchard,which used to be owned by my great grandfather, which now has gardens and ponds), and come out the far side at the bottom exit on Carrs Rd. Turn right onto Carrs Rd, then take a left at Bayfield Rd and a right at Blacks Rd, to rejoin Arcadia Rd at Arcadia Public School. Or just follow Arcadia Rd the whole way. There is a Monastery on the left at one point.
Arcadia Rd keeps on for another 5 km or so to the start of a long descent to Berowra Waters. This descent has some long straight sections, and a few bends, and is quite fast. Watch out for uneven surfaces and bumps, often hard to see in shadows cast by the roadside trees.
Down the bottom is a cafe and picnic area next to a Marina. The fish and chips an burgers are OK, you can eat in the cafe, or out in the picnic area if you have brought your own lunch.
After a break here the ferry is close by and a short trip across Berowra Waters gets you to the foot of the 4 km climb out up to Berowra. This climb is a steady one, narrow in places, and can be exposed to the hot sun in the afternoon. At the top is a place where many a bike rider has stopped for a rest, under some pine trees.
From here it is fairly level back to the Old Pacific Highway at Berowra. Turn right and it is a quick 12 km to Hornsby on a mainly good shoulder/bike lane.(At Asquith, take the right fork to stay on the old Highway back to the west side of the station.)
or look at route on bikely.com
