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).
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Nice shirt! You always find the cool stuff to do in Japan.Good luck in the NK!