I feel like if you love culture and learning about people, the month you're going to stay there is going to be fantastic. I wish I could've done that as well. There are so many other places to explore: Okinawa, Hokkaido, Mt. Fuji (which I didn't get to do), Hakone, Nagoya... Now that I'm listing everything, I so want to go back, haha.
Oh and if you love exhibits and museums, you are going to have such an amazing time. Nijo Castle and The Imperial Palace Exhibits, Osaka Castle, and just their art museums are fantastic!
Some of the most popular destinations are under renovation in the city though, so you might want to wait until after 2020, when they're done with the Olympics for a visit. :)
Oh, I'm sure it's going to be fantastic. I have friends who visited Japan before and they loved it :) It's not that far away for you so I'm sure that you can make it there again :)
Thank you for the tips! At least now I know that there is really so much to see that one month is a must :)
I will definitely wait until after 2020 then as I want to enjoy it in its full glory :)
Hope you had a lovely weekend!