Captain Harlock said:One that I believe was mentioned, however should be repeated.
Remember you are not in the US anymore. The laws, and customs, and social behaviors are different.
You are a guest.
Be respectful, polite and behave conservatively.
By conservativly, I think you mean that even if someone does not tell you that something is bad- you consider that maybe it is and refrain.
Yeah- don't wait until people tell you to stop doing something or that you are an idiot. They are not big on things like that. I know of one guy who was told by a Japanese shihan I used to train under to not come back anymore to training. (Rare case.) But numerous times this same Shihan used to tell stories about how big an idiot certain students were and let it be known that they were not worth the sweat over teaching them the important stuff.
So don't think that until a Japanese person tells you to stop that you can do whatever you want. Put yourselves in their shoes and think about how what you do might be offensive. Better to err on the side of caution.