I did a day trip from Toyko to Nokogiriyama (Sawtooth mountain) in Chiba prefecture.
It is a mountain with an interesting viewing platform with a great view. The mountain also has a temple that is home to the largest Buddha image in Japan (almost twice the size of Nara’s Todaiji Daibutsu).
Nice shirt! You always find the cool stuff to do in Japan.Good luck in the NK!