I think this poll needs to be clarified, or split into two. One is which school has the nice overall campus, and the other one is which school has the best
B-school campus. HUGE difference. For example, Stanford has one of the nicest university campuses, but the b-school campus is one of the worst in the nation.
Harvard's campus is nice on both counts, but the B-school "campus" is quite impressive.
UofC's B-school building is amazing, but the campus is ok.
Berkeley/Haas actually has a good university and b-school campus, probably among the top 5 for both in those schools listed.
UCLA has an AMAZING campus and b-school, especially for a public school. I would say I generally prefer UCLA's campus (the university) more than Stanford's (which I find very nice, but kind of boring).
Northwestern has a great campus, but Kellogg is only so-so.
MIT... um... no comment on both counts

Cornell has a breathtaking campus with waterfalls and stuff, but I didn't check out their b-school building, so I don't know how good it is.
NYU doesn't really have much of a "campus" to speak of.
I would love to visit Tuck sometime in October, but in other times, probably not a good idea (especially in the winter)