1.VISA

Well in advance of your trip to Japan, please make sure your travel documents are all in order. For specific purposes—such as tourism, business, or visiting family and friends—citizens of 68 countries do not require a visa, and will be issued permission for short-term stay upon arrival. To find out more information take a look at the website below.
https://www.mofa.go.jp/j_info/visit/visa/short/novisa.html#notice07
Citizens from outside of these 68 countries must apply for a visa before arrival in Japan, even if you’re just coming as a tourist. For further information, visit the website below.
https://www.mofa.go.jp/j_info/visit/visa/index.html

Japanese immigration are very welcoming to visitors but Japan is extremely strict when it comes to VISAs so this tip should be your first priority and don’t wait until the last minute.
Mark James Hill