The surrounding wine country is very nice, and relatively uncrowded. Roads are narrow with no shoulders though. Anywhere in the foothills is A+++ riding, but may not be the best for young kids. Look for state parks/campgrounds in the area; they'll usually feature a couple miles of uncrowded road and good scenery. I know you'll not be too far from Big Trees SP. Take a ride there with the kids one day; a kinetic wine tour another day.