I recommend the coastal drive for anyone who visits California. It takes about 8 to 10 hours to drive from SF to LA, but we divided it over two days which was more than enough to see everything we needed to without left feeling overloaded by driving and site seeing.
If you still need convincing, here are some photos of the scenic drive.
On this day The Son slept the entire car ride, The Man loved all the old ladies driving their Jaguars and I thought I was going to die by driving directly over a cliff.
Remember that you can click on any photo to enlarge!