If you're making the pilgrimage to SF, chances are very likely you'll be accosted by some aged hippy asking if you'd like to purchase one of many readily available psychadelics. Now let's say you think it would be a good idea to indulge yourself. Well, there are plenty of locations which would provide an inextricably "stimulating" experience. Here's a few.
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Alcatraz Island Light
see more on Alcatraz Island Light