So going with cadetdrivr's 2 out of 3 scenario, the best place is out near Pacifica.
I would however avoid the apartments that are in the news right now.
If you don't like the fog the next best area is in the east bay.
Check out Walnut Creek or Pleasanton/Livermore.
A little further out the road from Livermore is Brentwood/Discovery Bay.
All have small part time controlled airports.
The traffic from the North or South or from SAC is daunting to say the least; not that traffic from the east bay is much better.
These get pretty warm in summer but none are "over the hill" and in to the central valley.
Good Luck
Now if somebody could help me find our system timetable that would be wonderful.