It seems that American tourists stick out like a sore thumb whenever they hop into a new environment. This isn't necessarily a good or bad thing but it's pretty much undeniable. Too many things are way too distinct: Our accents, our fashion choices, our inability (or rather unwillingness) to speak a second language. Yep, we've definitely got a reputation.
In this Reddit list, people are talking about what behaviors scream, "I'm American," and some of these just feel way too personal.