y'all gotta start learning new languages if you're really bout this international life. it's irresponsible not to, just for your future's and your future children's sake(s). i'm not saying you gotta be fluent in 5 languages, but you gotta make an effort. if you really wanna ingratiate yourself to locals, the fact that you're american, native speaker of the most sought after dialect in the world, and you've bothered to learn to speak another language of a less powerful and influential country goes a loooong way.
I can't speak for Brazil, but in other countries, especially Second or Third World countries, if you know are at least conversational level, I will go as far as saying about 80% of the international play I got, was because I was able to communicate in the local dialect. Como se diz "swag" minha amiga?