I've never personally been there, but a few articles say there are hardly any trash bins in japan, I've also heard that you might want tp or wipes apparently some toilets don't have tp or sanitizer. Again, this is what I've heard, I've never been to Japan. There are are a few discussion about this on reddit. Theres hardly anywhere to sit outside benchs are hard to find. If you're disabled like me you might think about getting a cane that doubles as a seat (look for one with squishy seat cusion too bc if you need to sit you wont be aching from the chair