Anonymous wrote:Ohio state. Oops, sorry, THE Ohio state. We stopped by for a self-guided tour. Very nice student union, but the joke about Michigan that our family friend dropped in the admissions office as a test drew daggered looks from all 6 people there.

Saw similar intensity about hatred of Michigan touring the campus. Just a little too intense of a sports focus for both of our DCs.
Harvard. The campus is just sprawling throughout Cambridge. DC didn't like the scattered dorms, where the athletic facilities were, and the hodgepodge for different parts of the school. Liked the Law School area.
Princeton had a highly desirable program, and the campus was nice enough, but the whole eating clubs and academic plan just weren't what was expected. And then being in the middle of nowhere was not appealing to my DC. 1 hr train to either Philly or NYC wasn't a benefit.
Yale - as previously said, nice campus, surrounding area severely lacking.
UPenn actually rose on the list, but I can see why it would drop off some people's lists. It was more compact and dense than expected, with good access to the city, which was a plus for my DC.
I think there are two main things that can come from a visit - obviously the actual campus and campus feel, but also some nuances about student life and academics that are hard to tell from the website and online tours. Better if you whittle the list before you apply, but sometimes after you have admission offers, the tour ends up being the deciding factor.