Number 2 (is that number just supposed to be the place mentioned in this thread?)
Mall of America in MN:
http://en.wikipedia.org/wiki/Mall_of_Americahttp://www.mallofamerica.com/Why: It's a huge mall, gets lots of visitors from all over the country (and some from visitors to the country).
Most of all, because there's so many shops (over 520 and an amusement park) pulled together in one place, if they could get every shop in the mall to accept them, it could be a major place for Bitcoin enthusiasts to visit, and also could introduce it to many new people, and I'm sure it would get coverage from the news if they could/would decide to do that.