The Palace Legion of Honor is my favorite museum in San Francisco (& it’s up there on my list of favorite museums generally).  Its architecture is stunning, and you can feel like you escaped to Europe for the afternoon there.  There’s also a little bit of a spooky vibe, probably because I associate the place with Hitchcock’s classic Vertigo.  Right now, they are having a marvelous impressionism exhibit with tons of beautiful paintings.  I’ve said it before, but I really think modern fine art photography is heavily influenced by the impressionists, and this exhibit confirms my thinking.  If you’re around SF, I recommend making an effort to get there.  The exhibit closes August 3rd, so you still have a couple of weekends to make it happen.