There are a lot of interesting places and things to do in Japan. Japan Tour Apps can help a lot when making plans. First advice is to plan long vacation. 1 week minimum is my opinion. Know the weather so you know what clothes to wear. For things to do, research online because it will all depend on what interests you. I’m sure there will be something that will suit you as Japan seem to have everything a tourist would want. It is important to have a Transit/Train/Subway App as you will use it for sure especially if you are on limited budget. Surprisingly, convenience stores have quick but good food selection.