Just be polite, be yourself and having a badic knowledge the German language without using the a cellphone language translator is big plus.
Other countries see Americans as lazy and just depend on Google translation.
So just even knowing basic key phases that helps a lot. Like for example: Where are the restrooms, Where is the Hotel (the hotels name), where is a good place to eat. Well you get the idea.
Pepper spray is legal, stun guns require a training course to use without getting into trouble there. You can carry a knife there, but its touchy on what area your at. Check before you go.
