I am a big fan of traveling to Japan and have been a number of times, including a three month stay back in 2018. My favorite places to go in Japan are:

#1 Tokyo

#2 Sapporo

#3 Kyoto

Click on any of the pins to see some recommendations and photos from my past trips.

For more info Japan Guide or /r/JapanTravel on Reddit (where I am a mod).