McCarrs Creek Road
(google map )
Mc Carrs Creek Road runs from Terrey Hills to Mona Vale, it's 11 odd km of tree lined twisty road... The western end is 25km from Sydney, you can approach either from St Ives along Mona Vale Road, or via the Roseville Bridge and Warringah Road to Frenches Forest and turn left onto Forest Way then right onto Mona Vale Rd.
The entrance to Ku-ring-gai Chase National Park comes off this road, be aware that using the park's roads attracts a fee ($11 as of Dec 2006).
There's fuel available near the bottom end, a BP and a Mobil on the right just a half a km or so north if you turn left onto Barrenjoey Rd, and another BP just south of there which is more difficult to get into since it's on the wrong side of the road without a convenient nearby side street. At the western end though, the nearest fuel is in Belrose on Forest Way or back towards St Ives on Mona Vale Road.
There are a few cafes towards the eastern end, one at the Church point Ferry Wharf, there's a couple of marinas in Bayview with cafes in them, but I reccommend Flying Fox Cafe (google map - there is actually a street there, its not on googles road map database yet...)
There's a small motorcycle workshop in Mona Vale called Motorcycle Weaponry on Willmette Place (google map Ph:9979 4744) who are good guys - they're open Saturday mornings unless Steve is racing...
West to East:
Then you can turn left to head towards Newport and Palm Beach on Barrenjoey Rd, or right to head towards Narrabeen and Sydney.