I interviewed at the following: UCI, Harbor, Loma Linda, Davis, and Stanford, and rotated at UCI.
UCI: Poopy facility. Little curtains are all that separate your patients. So uncool. Cramped little ED. So few residents the conferences aren't quite as good as some places I've seen, simply because the residents have to do more of them and so have less time to put into each one. Traumas are very regimented, for better or for worse. Trauma bays are very cramped, but adequate. Their obs units consists of two beds they call "obs beds." Truly superb ultrasound program. Not a big fan of the faculty, aside from Fox.
Loma Linda: Pathologically nice people, great peds experience. Smog like you've never seen it before.
Harbor: The patients bring three meals, a blanket, and a pillow if they're not bleeding or having chest pain. Metal detectors on all the doors. Lots of single residents who enjoy the night life of L.A. A little less supervision than you would get at the average program. Some big names, but they can't be around very much judging by how often I see them elsewhere.
Stanford: I got a bad feeling. Some weird juju. Maybe it was the orchestra in the lobby. Maybe it was the $3000 signing bonus. Maybe it was the residents talking about how Palo Alto was the garden of eden. Dunno, but didn't rank it.
Davis: Actually ranked it second on my list. Liked the residents. Liked most of the faculty. Liked the location (halfway between San Fran and Lake Tahoe.) Tons of blunt trauma.
Keep in mind, all this info is 2+ years old. Things change.