If you can't visit a hot spring place outside of Tokyo, this place is perfect as it is located within Tokyo. It is located in Odaiba and is easily accessible by the monorail. You receive a wristband when you arrive and you use that wristband for purchases within the area. You can purchase food, drinks or services such as spa treatments. You are also given a yukata when you arrive which you wear inside the area. It really feels like you are in a Japanese festival! They have an outdoor foot bath which you can enjoy with friends!
This place is a must visit as you can get the same view from Tokyo Tower or the Sky Tree for free! It is located in Shinjuku (about a 10 minute walk from Shinjuku station). At busy times there is a little bit of a line but it goes by quickly. Depending on what tower you go in, they have different souvenir stores.
Lots of great food here! It's located just outside Shinjuku station. Some of the store are just standing food stores for a quick meal, and some of them are really small stores where you can sit down quickly for a bite to eat. The atmosphere makes you feel like you have stepped back a hundred years. There is a wide variety of different foods here!