Northern or Southern California? In Northern Cal. You could look at El Dorado Hills, Cameron Park, Shingle Springs or a little further down the hills to Folsom or Fair Oaks. Depends on how rural you want to be. Placerville and Auburn are nice you with lot's of small towns around them. Way too many to list but that should get you started.
San Francisco has trees and flowers. I went to visit my step-daughter for Thanksgiving a few years ago and was pleasantly surprised to see so many flowers blooming. It is awfully expensive to live there though. Stay north of San Francisco and you should have plenty of woods. I have a friend who lives in a small town called Murphys, CA. It is in the foothills of the Sierras and from the pictures I have seen, it is a beautiful wooded place.