California planning

We've been longing to see California since forever. But in the last years it was a very remote possibility, but now we are actually planning to go there some time this year. Right now we are looking at August-September-October.

So right now we are at the planning stage. We want to fly to SF and then go somewhere. Definitely looking at Silicon Valley. Possibly driving south to LA.

so here I am asking for your advise. What to see? Whom to meet? Where to go?

help, please :))