Japan

Mt. Fuji is a tough but gorgeous hike. It is much shorter than Grand Canyon or Mt. Whitney and can be done on a day trip.

Unlike Tokyo, Kyoto is a nice and cozy city. We started the day with a walking tour that gave us an intense view of this city of shrines. There is a lot to do in this city. However, I would recommend focusing on a few of the best specific shrines. Inari Shrine - do the full mountain hike to the top and check the small waterfalls on the backside Kinkaku-ji Shrine Ninna-ji temple - a 1200-year-old temple with several statues of Hindu gods sculpted in 800 AD....

Tokyo isn’t a city per se but a prefecture. A prefecture is more akin to a county in the US. Japan has 47 prefectures. I would recommend two important cities in Tokyo to spend your time in - Akihabara Electronic District and Shinjuku (fancy) District.