Trying to learn from past travels, my wife and I realize that big, noisy crowds ruin even the best museums and attractions for us. Exploratorium is probably not on the menu for us.
Are there any smallish, not-so-common places to go that you'd recommend?
To give an example: when we went to D.C., the Smithsonian's american history museum was wall-to-wall people and we couldn't wait to get out. However, the soldiers' home/Lincoln's cottage in the suburbs offered a tour that only 3 other people took. Very interesting, and a highlight of our trip, but not a crowd pleaser.
Any museums, activities, sites of interest come to mind re SF and environs? (We'll be walking or using public transp, BTW.)