Start from your hotel in Tokyo 23 wards and travel to Tanigawadake in Gunma prefecture.
You could watch the breathtaking view of Tanigawa mountains at Tenjintouge observatory at an elevation of 1,502 meters after 15-minute ride on the rope-way and 7-minute ride on the Tenjintouge Pair Lift.
Next, experience long down stairs of Doai underground station. (called the deepest Mole station in Japan)
It takes 486 stairs in total to reach the platform of the station (about 82m depth from the entrance.) and is like an exercise for your leg.
*Please note that there is no lifts and escalators and so, do not overdo the exercise if you are not confident in physical strength.
Finally, travel to Ikaho hot spring town where you could buy various souvenirs and could experience hot spring.
Conclude the tour when you will be dropped off at your hotel in Tokyo 23 wards.