A must do in San Francisco is ride the world famous cable cars. The lines were worth it for us, just steps away from our hotel and it took us right down to Fisherman’s Wharf. I would recommend just taking it one way, one time because you do have to wait -up to an hour for us. The views from the hills of the city while you are holding on to the outside of the cable car is priceless.
If you are a huge cable car fan or want to know more about how it works, there is a museum you can visit.