An electronically readable international passport is mandatory for travelling to the USA. Your passport has to be valid for the entire stay. Also children...
Quickly light a sigaret? Think twice where you'll do it. You can't smoke in public wherever you want.
Manny countries have laws against smoking, but...
Tipping is an American tradition you really should know when travelling to the USA. It can be quite confusing to tourists.
Waitresses, bartender, taxi drivers,...