I am taking an actual vacation at the end of the month! I am going to visit a friend in San Francisco for 2 days and then another friend in Seattle for 4 days. I've never been to SF before, and I was only in Seattle for 3 days for a conference, so I didn't get to do any touristy things. What should I make sure gets on my list of things to do/see? What isn't really worth the time?