I'm suggesting the Sonoma coast.
https://www.sonomacounty.com/article...s-sonoma-coast
No glitz, beautiful countryside, generally uncrowded
Note that in our summer, the coast can be quite cool, windy and foggy at night, and often (but not always) clears up during the day, and is rarely hot. Inland, even a short distance (past the coastal hills), can tend to get very hot (but nights are generally delightful)