San Francisco: Any advice?

In ten days, Alex, Toby and I will be taking a long-awaited trip to...San Francisco! We're staying in Noe Valley and can't wait to walk across the Golden Gate Bridge, hang out with my sister, and ride these insane-looking cement slides. Alex also wants to walk around Berkeley and reminisce about his college days. We don't know the city that well, though, so I'd love to ask: Do you have any