It is enough that you visit KYOTO and HIROSHIMA.
In KTOYO, you can feel old japan（historic monuments, temples..) .Also you can eat traditional japanese meals.
In HIROSHIMA, there is nou normal town, but if you see atomic bomb dome,to you can feel world war 2,and prey for peace.
Kyoto and Hiroshima are both beautiful and must-visit cities. You should visit all the places if you have time! Kyoto and Hiroshima are pretty close to each other comparing to Tokyo, so how about leaving Tokyo for your next visit and stick to western side of Japan for this time?
Tokyo has lots of attractions, so please come back to Japan to visit Tokyo, too!