Eat ramen, go to onsen, drink lots of meticulously brewed coffee and tea.
https://www.google.com/maps/d/viewer?mid=1HTIv_LhyXh3NfI-YQkqI1mycIhwZGYAP
Hakone 箱根
A spa resort town. There's nothing here but hot springs, and there are many to choose from. Search around on google maps, find one you like and make sure you can visit without staying in the hotel. https://en.wikipedia.org/wiki/Hakone
Nikko 日光
Nice temples and scenery. One big hot spring. https://goo.gl/maps/z6UwgtTCeyA2
Kamakura 鎌倉市
Historical shrines & things. A pretty town to walk around. https://en.wikipedia.org/wiki/Kamakura#Notable_locations