I've been to California exactly 5 times but 4 out of the 5 were just changing planes at LAX. The other time was earlier this year for work. I flew into San Francisco and drove to Modesto. Unfortunately, other than Modesto and the drive to/from the airport I didn't get to see much.
Sounds about like my trip! I hope you find your way back there at some point. My wife and I are hoping to travel out that way together one day.