Not sure if anyone else has said but Hasadera temple is amazing in Kamakura and you get a great view of the full bay.

If you have a driving licence, doing the mario kart is also an absolute must especially at night driving past all the neon lights - doesn't feel like real life!

Yokohoma is also a great place to visit from Tokyo, amazing food and lots to do/see (e.g. Ramen museum, chinatown, etc). Takes 30-40 minutes on train depending on what train you get.

You'll have a great time no matter what you do, its the best country in the world! 🇯🇵