What to Expect
You can see beautiful Japanese folkhouses from the samurai period to the former century carefully preserved. Some are from the same area with Shirakawago, the World Heritage. They make you feel travelling back to the past as if we used a time machine. These houses are built without using nails.
The farming tools, weaving machines and daily utensils are also displayed, so I would explain about the Japanese culture, and answer your questions about them. Some of the houses were moved from Gokayama many years before it was acknowledged as a World Heritage. If you don't have the opportunity to visit Gokayama or Shirakawago, you can get the feel of it by visiting the houses in this museum.
After going up the hill and exiting the open-air museum, we'll walk ten minutes or so to Mt. Masugatayama, where we could view the Metropolis Tokyo.
Traveling back to Shinjuku, we will go to the observation deck of the Tokyo Metropolitan Office. During the twilight, we might be able to have a better view than daytime.
If you still have enough energy, I can walk with you to the one of the following options: 1）Samurai Museum (1900 yen, children 3-12 800 yen) , ２) the entrance of Robot Restaurant, ３）the entrance of a beautiful Japanese restaurant using a former mansion (yashiki)：Reservation is desirable, so please tell me if you would like me to book it for you. They could serve vegetarian cuisines if booking three days in advance, 4) Gonpachi, the Kill Bill restaurant in Roppongi, using Subway, or 5) Shibuya crossing by eight-minute train ride.