The Castlewood Hill course (1926) was my first taste of a private golf course a couple of years ago. The par 3s are quite good and feature a lot of variety. #4 is and uphill through a shoot of trees. #6 is short a short iron slightly down hill with a large drop off to the left. # 12 is a shot to mid-rion slightly uphill. # 17 is straight down hill and approach shots must land short of the green to hold the surface unless the ground is sopping wet.
Of the par 4s and 5s, the course is definitely short and tight as a rule, but there are options on each hole. Few holes require driver, but advantages can be gained with long hits off of the tee, especially if you're looking for flat ground on your second shot.
The entire course has that classic, old-timey feel which is hard to articulate. There are many houses on the course, but they aren't too intrusive. The course is on the side of a hill and features some tricky lies and quick greens. The thick forest of old, specimen oaks and panoramic views from the upper holes are sure to please. It's a little more than 6,200 yards total from the tips.
The club also has a newer "Valley Course" that was built in the 60's by William Bell Jr. It's a pretty standard test. Longer and flatter. The best holes are on the periphery where the ground has more movement.
Neither course is mind-blowingly high in quality, but the Hill course certainly bears a look for someone visiting the East S.F. Bay.
I'd give it a 4 on the Doak scale on a lenient day.
http://www.castlewoodcc.org/default.aspx?p=DynamicModule&pageid=248503&ssid=105330&vnf=1