That's like asking which child 🥲
Obviously Tokyo for the classic experience.
Kyoto is stunning.
Osaka for food
Hiroshima for a lesson in history and the folly of war.
Take the bullet train "Shinkansen", visit an Onsen, hot spring bath.
If you get a chance, stay here and report back, I have never been:
https://www.youtube.com/watch?v=8BLRB3T6-OM
