Japan is a diverse country. While Tokyo is a major world city there is also so much else to do and see in Japan. I am often asked how much time is needed for Japan. After living here 5 years, here is a very basic outline.
1-3 days: Stick to Tokyo
4-5 days: Add 1-2 side trips within the Greater Tokyo Area
Fuji 5 Lakes Region
Nikko
Kamakura
Hiking in Western Tama
Yokohoma
7-10 days: Add Kyoto & Osaka/Nara
2 weeks: Add Central Honshu, Nagasaki, Okinawa or Hokkaido
3 weeks+: All of the above
Check out the Japan tab on Life Kinetic for specific ideas about each of these destinations!
Life Kinetic Travel Research 