I would love to go back to San Francisco one more time, but not sure I ever will at this point. Was last out there in 2004 and even then the homeless population was out of control in the tourist areas. Can't imagine how bad it would be now, coupled with increased crime. And it's such a shame, because it's a beautiful city. And to tie it into the theme of this post, a sourdough bread bowl filled with hot clam chowder at Fisherman's Wharf on a cold night is tough to beat.
To me, Philly seems like a filthy city, on par with New Orleans, but without the charm.