While I'm absolutely horrified and embarrassed by the state of our country, I must admit that my level of excitement for the US hosting much of this tournament is through the roof.
I was 10 years old when we had the tournament in '94; up until that point, watching football matches really wasn't widely available in the US unless you had cable, which we didn't. So the tournament was basically the first time I was able to watch professional football on TV. And of course hosting the tournament was what facilitated the creation of MLS, which was very exciting for us kids, especially because at the time I lived in one of the cities that got an original club.
For anyone who is planning on traveling to the US for the first time to see some matches, I highly recommend picking matches in Boston or Seattle; they are both wonderful cities with a lot of cool stuff to see, and the weather should be pretty comfortable. Boston, especially, is a wonderful city with a lot of cool history.
If you're planning on having a walk around town while you're here, just know that the weather in Atlanta, Miami, Houston, and Dallas will be miserable; the heat and humidity will be ungodly.