Denmark: Do not stand on or walk on our bike lanes. You’ll be yelled at like never before or possibly be run over by an angry cyclist.
Don’t tip in Japan.
Don’t do it.
If you try, whoever you attempted to tip is likely going to be a little upset. You are pretty much calling them unprofessional because you think they need that extra help or something.
It’s not country based, but if you come visit Alaska, for the love of all that is holy, DON’T WALK ON THE MUDFLATS OUTSIDE OF ANCHORAGE.
It is quicksand and you will get stuck, then the tide will come in and you will die. Seriously, it happens to one or more tourist every summer.