It is also exotic and exciting. Public transportation is excellent, although crowded. There are very few problems you can run into that are dangerous or frightening. So relax and enjoy. Carry a small pad and pencil or pen.
Sign language is good, too.
Get used to being stared at. Students may try their English on you. It is apparently not impolite to ask questions that we usually would not - for example, your age. Answer however you like, but don't take offense. Try not to get upset when you don't understand what's happening, the Japanese are really trying to be helpful.