I think San Francisco has a lot of great museums but I like the mural art in Clarion Alley which shows a different side of the city. Clarion Alley is located in the Mission District and is run by the Clarion Alley Mural Project, an organization whose aim is to showcase artwork created by new artists with a social justice message.
The murals, which are continuously rotated to feature new art, first went up in 1992 and have become really important for the neighborhood to promote equality for all no matter your social, economic, or political backgrounds.
The organization offers tours of Clarion Alley every other Saturday or you can schedule a private tour if you like. I like to just stroll down the alley and take my time looking at each piece of art and take pictures to share because it is one of the most photogenic alleys in the world! It is indeed art that should be shared.