Stupandaus, you have provided some nice info on the schools you visited and this should be helpful, especially to those who haven't had a chance to visit. I thought I would add to it. I also visited a subset of 6 of the Top 16 schools. Since they are mostly different from those Stupandaus visited, I thought I would share my impressions. To give some context, I visited this past February while I was interviewing at the schools. I was also an international applicant, so I was visiting from abroad.
Wharton: Can't really add to what Stupendaus said as I didn't get the chance to sit in on a class.
Booth: By far the most gorgeous b-school building among the schools I visited. The Harper Center just blew me away. A lot of "superstar" students (and applicants) with prior experience in MBB or BB IB. Although Booth is known for Finance, there is a lot of emphasis on Entrepreneurship and with the Polsky Center they definitely have the resources to help would be entrepreneurs. They even give you office space to set up an "office" if you start a company while at Booth. They also really marketed their "flexible" curriculum and noble laureate faculty to applicants. Current students mentioned that among the current crop there was higher interest, and hence more competition, for Management Consulting than for Finance.
Tuck: The students at Tuck were by far the most enthusiastic about being there when compared to students of the other schools I visited. The facilities were great and it is one of the few b-schools in which most 1st years live in dorms on campus which I thought was fantastic. The students were very eager and engaging in the class I visited (they were doing a case study). The Tuck campus is gorgeous and life at Tuck seemed a bit removed from the rest of Dartmouth, which I think is one of the reasons that Tuckies are such a tight-knit group. Every one I met seemed really fun and students came from diverse backgrounds. I actually spent a good portion of my interview discussing online poker strategies with my interviewer (a 2nd year student)

.
Ross: The facilities are great especially with the new building (completed a couple of years ago I think). Typical Big 10 campus with the business school integrated into it. And I think they make everyone drink some sort of Michigan kool-aid that makes them love football. EVERYONE of the students I talked to loved Ross and mentioned Michigan Football, partying and drinking! They were definitely a fun bunch

. There is heavy emphasis on MAP which I personally think is a fantastic opportunity. The quality of students seemed great although maybe not as consistent as at Booth and Tuck.
Darden: Definitely the best weather among the schools I visited. The b-school building is not as new as Ross or Booth but not too shabby either. It is 100% case study and that seems to take its toll on the students. Several students I met told me that they spent an ungodly amount of time studying. Nobody seemed happy about the workload. They did seem like a tight-knit group but more in the sense of sharing a "foxhole" together. The class I attended was by far the best and most engaging one among my schools. The No 1 faculty ranking is definitely well deserved. The professor was awesome, and the way he kept everyone engaged was extraordinary (and it was early in the morning too).
Cornell Johnson: The b-school building and facilities were OK but nothing great. Its very integrated with the rest of the campus which is quite beautiful. The student and adcom heavily market it as an "Ivy League MBA" and make use of the Cornell brand name often which I think says something their lack of confidence in the Johnson brand. I wasn't really as impressed by the student body as at the other schools I visited. A few 1st year students I met and talked to while randomly walking around campus seemed extremely unhappy about the course load of the core courses during the 1st year. Since they had to go off-campus for recruiting it severely affected their schedule. They told me that if I ended up coming to Johnson I should test out of as many core courses as possible. And hardly anyone wanted to participate in the class I attended although the professor was great (though to be fair it was a finance class).
In the end I ended up choosing to attend Tuck over Booth because of the campus environment and because I "connected" more with the students there. Had I not had the chance to visit, I would have most likely picked Booth because of the higher ranking and brand name. I would urge everyone who has a chance to visit the schools they apply to, even international students if they can manage.
I hope this information is helpful to others. Please do keep in mind that these are all great schools and I am comparing them to each other and not to any school outside of the Top 16.