i am going march but not with JY,i arranged my own flight and all the travels.this will be my 7th times in JP.
you will love it there.people are very polite.food is lovely specially if your adventuous and want to try their cuisine.
yea hiroshima is fab,sad tho when you see the museum about the atomic bomb victims.
tokyo is electrifying,specially if your visitng the electric town of akihabara.
ueno (tokyo) for the asakusa temple.
kyoto is cool,old,and charming.
hope you will try onsen its a japanese hot spring bath.the best ones are in kusatsu and beppu.
enjoy.
eric