Something really cool to do if you're in like Moewa is, it's really tiring but it's super pretty and definitely worth it, is to hike Moewayama, the mountain there, because it's just so pretty, especially at night. If you're in Asahikawa, which is also the best, is, I really liked going to the zoo there, Asahiyama Zoo. It's really fun.
If there's one thing that the Japanese do well, it's parks and public recreation. Most cities have several parks. A lot of them, even in small towns, will have a public gymnasium. There's a weight room. There's often a pool. You can play basketball. You can play volleyball, table tennis, badminton, all kinds of things. If you are in Iwamizawa, there's the Greenland Amusement Park. Asahikawa has one of the best zoos in the entire country, Asahiyama Zoo.
There are these giant bubbles that are like rubber bubbles there on the ground. They're like filled with air or something and you can like jump on them like a trampoline and they're like super cool.
Just go out and explore. There's castles, there's temples, there's shrines everywhere. You learn a lot about the culture just by getting out and exploring. Kyoto, Osaka, Kobe, great spots, but any area in general, just get out and explore.
I went on a lot of bike rides through Japan. I went on a lot of hikes, but there's just so much to do. There's so many historical places to go visit, so many cool shrines and temples to go visit. That was way fun. I made great friends doing that.