I went to Kesennuma/Minami Sanriku in Tohoku which is the devastated area by Tsunami when East Japan Great Earthquake occurred.
This was a 1 night 2days volunteer tour organized by my friends. 22 of us took a minibus to help reconstruct the devastated area, and to do some Hanami too for fun (although there was almost no cherry blossoms in Tohoku yet…).
Although this area has been mostly cleared up, there is a long way to go.
Tohoku definitely needs more volunteers. Please go help if you have a chance.