Last year we ran a story called "Are You the Ugly American?"--about ways not to accidentally insult the locals when you go abroad--that ticked off some readers and pleased others. And last Sunday, The New York Times ran a kinda d-u-m story on the topic (but without the advice). But no one, to my mind, has captured the essence of being a thoughtful traveler the way a NYT reader, D.Y. Milch, of Stony Brook, N.Y., did on today's NYT letters page. "All people make for poor tourists who go to visit things and not other people." Well said.