I live in suburban Washington, DC. The American tourist is here all summer. I've travelled a good bit to our national parks, always lots of tourists out there, including a lot of Europeans.

I think it's harder for Americans to find time for travel purposes. On average, we don't get nearly as much time off as Europeans. Plus, it's really not unusual for Americans to move 1000 miles or more to find careers. If you get three weeks off every year, spend one visiting the folks back home, it really doesn't leave much time to develop a roving habit.