In the manual for my study abroad in Germany, these are some of the instructions for students regarding "Student Safety and Good Conduct":

-At a time when American foreign policy is viewed with dismay and hostility by many persons abroad, behavior that dredges up memories of colonial arrogance or the "ugly American" of the 1950's has no place in EAP programs anywhere in the world.

-All students should avoid "appearing American," through many simple actions such as not wearing certain baseball type hats, avoiding large outings with other compatriots, and avoiding any behavior that draws attention to themselves.

-DON'T TELL ANYONE YOU'RE FROM AMERICA! (Ok, I made that last one up)