I haven't been everywhere in CA, but these are some of my favorites:
-Carmel- really nice area on the Monterey Peninsula.
-Santa Rosa- north of San Francisco
-Grass Valley- nice community in the foothill northeast of Sacramento
-Placerville- south of Grass Valley
-Rancho Santa Fe- north of San Diego- great schools. CEO's, professional athletes, and old movie stars for neighbors.
-Palm Springs area- nice for a winter place. Kinda hot during summer months.
-Any house close to the beach from San Diego to Carlsbad.
These are just a few of the areas I would consider if I won the lottery and did not have to work. There are actually a lot of nice areas in CA, just depends on your means and needs. We used to live in San Marcos. There were areas in SM I would not live in because of crime, crummy houses, lack of views, etc. We were in a great older neighborhood with views and friendly neighbors. We moved to CO and it's the same here. There are places I would not want to reside in. We found a place that we like and afford. Is there places I would rather live? Vail looks nice and I love to snowboard. But due to financial shortcomings, we had to settle
Maybe you could elaborate on things you are looking for and how much you want to spend. For instance> my daughter's piano teacher sold her house in Carlsbad and bought a mobile home in the Newport Marina. It cost her close to a million dollars. It's pretty nice with a private dock. She thought Carlsbad was lacking in culture and she's used to high society types.
Good Luck with your search