These are my preliminary choices for California elected positions and ballot initiatives. Some of them are based on Ozy's recommendations and the Berkeley EA and rationalist community's recommendations. I agree with the latter's note that because California ballot propositions are weird superlaws that permanently overrule the legislature unless repealed by voters, in general we should be very cautious about them (though some of them were recommended by the legislature itself, since for complicated reasons it needs voter support to do certain things).
I'm giving first-level justifications for my votes (ie "I support this person because she wants higher taxes") but not always second-level justifications ("here's why higher taxes are good"). You can usually find discussion of these on other blog posts.
Governor of California is the big one. Democrat Gavin Newsom is a former successful businessman, mayor of San Francisco, and lieutenant governor of California (also second cousin of musician Joanna Newsom). He has stated that if elected, he will let people call him "the Gavinator". Republican John Cox is a former successful businessman, best known for sponsoring a ballot initiative to make legislators wear the logos of their top 10 donors on the State Assembly floor, "much like NASCAR drivers". He also has a fascinating plan to reform politics from the ground up with a 12,000 (!) member legislature. I don't really like Newsom – he led a movement called "Care Not Cash" to restrict giving money to the homeless, and supposedly opposed anti-gay Proposition 8 so incompetently that his statements may have increased support for the measure. He also had an affair with his campaign manager's wife in a scandal that seemed unusually scummy even for a politician. I like John Cox as a person, but he doesn't seem to have any relevant governing experience. And he was anti-Trump until Trump became popular among Republicans, then about-faced and decided Trump was his new best friend, and now he's basically just a Trumpist. I am going with Newsom; God help me, God help California.