I'm actually going to visit Penn, but that is more to do some research for my "Why Penn?" essay. I also have a good friend that lives close to Philly, so for me, it's not just visiting the school. Plus, I managed to get an airplane ticket for under $150, which was pretty awesome. While I'm up in that corner of the country I was going to go into NY one day and check out a class at NYU and Columbia. However, if I wasn't going to visit Penn, I wouldn't visit the NY schools.
I'm going to base other visits on acceptance. I can't take that much time off from work and since I'm going to have to fly everywhere, it's going to get pricey.