I have often wondered who would chose to live on the famous crooked stretch of Lombard St., with people walking and driving down it all hours of the day and night. But for the visitor to San Francisco, you just have to see it. If you have a car, head to the section of Lombard between Hyde and Leavenworth and start your decent. If you're walking, you can reach Lombard via the Powell Hyde cablecar. The flowers along the street are lovely in the springtime.