The first Thursday of March Madness is one of my favorite days of the year. Four tournament games going at once, upsets, last-second shots; it's a beautiful day. It really should be a holiday in the United States.
I don't have any statistics to back this up, but I am confident to say that you could go by any bar or restaurant with TVs in this country that happens to be open right now and there would be crowds gathered.
The only trips I've been on during the tournament (other than to actually attend tournament games) was college spring breaks. So I haven't been faced with the decision of whether to find a place to watch games or go about the business of the reason for my trip.
But I'd like to think that if I were traveling for vacation/leisure purposes, I'd have to cut away from a day of museums and sightseeing to spend a few hours at a local bar, especially if I happened to be in a city that has a local rooting interest in the tournament.
For example, I imagine it would be a fun experience to be in a bar in Philadelphia's City Center with TVs tuned to the Villanova/Robert Morris game, which as I type this, is tied 58-58 at the end of regulation. To experience the joy, pain and nervousness of these fans while not having a rooting interest would be great.