Bon V.
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You will see and experience everything here.
The scenic view of Mount Fuji, Glass Museum, Aquarium, Shrine, Pirate Ships rides in the Lake Ashi, Magical Black Eggs of Owakudani, Ropeway ride over Fuji Hakone Izu National Park, Tozan Cablecar, the Hot Springs (onsen), and many more.
Though one day trip is possible, to cover all the major attractions, from Tokyo, you need at least two days to cover everything.