Stairway Walks in San Francisco

I recently bought a book called 'Stairway Walks in San Francisco.'  There are these amazing stairways all over the city and the book gives you a lot of history and details about each walk.  So I think Chris and I are going to try one of them out this weekend, if his studying allows him the time!  I am really excited, because it gives you a different perspective on the city and the neighborhood that the walk is in.  Some of them are "hidden" so you would never know they are there unless someone tells you!  I will try to take some photos if we get to go this weekend, and post them next week!  Hopefully we aren't too sore afterwards!  :)