For intense driving pleasure, you'll want to drive California State Route 1 between at least San Luis Obispo and San Francisco. That takes in the most scenic portion of SR1 south of San Francisco. The road runs along the coast and has lots of twists, turns and grades to keep you happy. Unfortunately, it is also bound to be crowded (summer tourist season) and that will slow you down some, but nonetheless you will enjoy it. It's a driver's road.