Some old fashioned but definitely not overrated visiting spots!
Visit the hot springs! Japan has really good natural hot springs. There's also some really cool manmade ones too that you should visit! Take a look at a video from the Business Insider of the Yunessum Spa and Resort. I know its weird but it's pretty COOL. I've been there before and loved it!
More strange lovely things of Japan include the black eggs of the mountain town, Owakudani, Hakone. The black eggs are ordinary chicken eggs but boiled in the sulfur hot spring located there. The phenomenon of the black eggs are cause by the sulfur water that turn them that color-- but they are completely safe to eat and are delicious.
The Osaka Castle is an historical site! I loved to visit there when I was a child. It's sort of a park now I believe. The history behind it is really cool; the Osaka Castle was the former site of the Ishiyama Honganji Temple before it had been destroyed by Oda Nobunaga thirteen years after it was built (if I'm correct). It was like the largest castle at the time and is currently very modernized and cool on the outside now. There's also a huge garden in the courtyard that you should definitely explore if you get the chance.
ANYWAYS that was just a couple of my favorite spots in Japan. Hope you find this useful :airplane: :airplane: :airplane: