Walked down Haight street today, thats where you really understand why San Fransisco has a "hippie" reputation. I walked around for hours and had fun in all the small crazy little hippie shops. You can also find vintage and "buy, sell and trade" shops on every corner.
This area is definetly a part of the tourist slope, but you can totally kill some time here. I was also told to have a slice of pizza at "Escape from New York", wich was an awsome slice of pizza. If you happen to be on a low carb diet, there is other options in the area. But my life is to short, to not eat carbs.