I almost forgot to mention my favorite part of California..... the trees. They are truly magical in that part of the country. Red wood, sequoia, cypress - all thousands of years old.
If you ever stay in San Francisco, make sure to make your way up (when I say up I mean a very steep and windy way up a mountain) to visit the Muir Woods Forest. It is absolutely breathtaking! Did I mention that these were the type of trees you could actually live in??