Lombard Street (Crookedest Section)

Lombard Street in San Francisco, California, partially described as U.S.P. Highway 101 runs, is feeder to the Golden Gate Bridge and one of the main thoroughfares of the city. However, Lombard Street has become known as the winding road in the world.
Lombard Street runs from the Presidio to Telegraph Hill across San Francisco. The winding part of the road is located on Russian Hill and extends over just one block between Hyde Street and Leavenworth Street. At this point, it was one of the city's steepest streets with a 27 percent gradient, which was problematic for many cars and pedestrians. Therefore, it was rebuilt in 1922 in serpentine form as a one-way street (bergabführend). The only two blocks away Filbert Street even has a gap of 31.5 percent, but was not defused and so could serve in many films (including Bullitt) as a "ski jump." (Wikipedia)

From Telegraph Hill there is a good view of Lombard Street, which is a road with many hairpin bends as it would be too steep to descend directly. Of course the road is one way! In between there are many flower islands, very nice to look at in summer when walking through and driving through, you should do both when you are in San Francisco.

Not an insider tip - you have to experience it. An experience on foot too.