Don't forget to bring a warm jacket!
We have visitors from Germany quite regularly - usually in summer. Sacramento summer is often like being in a convection oven. On the day that we take our company to the City, I grab my winter jacket and tell them to take their jackets. The answer is usually the same: It is summer in CA, we don't need a jacket. By now I figure that they all want to own a San Francisco sweat shirt. lol
The clam chowder in a sourdough bread bowl along the wharf is a yummy treat.