Meh. Chicago beats San Francisco tourism numbers both in number of visitors and in overall tourism revenue, and while I will forever love Chicago foremost among all US cities, one place where I think we can clearly concede an advantage to SF over Chicago is tourism --- the SF sights, the ocean, the woods to the north, the nearby mountains, Silicon Valley, the Chinese culture, the history of the region. Chicago is practically the apotheosis of "going to see X, Y, and Z which happen to be in Chicago", and it does fine.