Things that you wouldn't know if you've never stayed in Japan before
Japan is an advanced, international well-knowned country in the world. But there are few things that you might not know about Japan. The language. Ahh, yes. Japanese. The language actually comes from Old Chinese and Old Japanese. They have lots of words that took the pronunciation and translate of Katakana directly. Therefore, most of the people there has lousy pronunciation of English. So bad that you could might only catch a word or two. It's a little rare to see the locals speak fluent English. Ofc, I am not counting those who had stay outside the shima-guni（島国,"isolated" country, Japan is an island itself）. So, be patient if you meet someone who doesn't speaks good English. And this will bring me to the next point. Asking for directions is hard. Might as well just Google Maps or something. That way is much efficient. Lacking the ability to speak English makes them hard to express themselves. Some of them will look at Google Maps for entire day and tell you...