Just came across a newspaper article which says that the US State Dept has issued a guide to American travellors abroad on how to behave and conduct themselves in a way that will make their journey more enjoyable, and at the same time improve the rest of the world's perception of the USA and its people.
some fair use excerpts:
"Think as big as you like but talk and act smaller In many countries, any form of boasting is considered very rude. Talking about wealth, power or status - corporate or personal - can create resentment."
"Think a little locally Try to find a few topics that are important in the local popular culture. Remember, most people in the world have little or no interest in the World Series or the Super Bowl. What we call "soccer" is football everywhere else. And it's the most popular sport on the planet."
I personally like Americans. These guidelines are however so true is so many cases! So if you are American and are travelling, or know someone that is travelling then read or pass on these guidelines, I think you will find your trip will be much more pleasant and people will be more helpful to you.