You may have a impression about nuclear disaster at Fukushima power plant in March 2011. In fact, there are still a lot of people who cannot get back to their home due to the high radiation level, however, Fukushima prefecture is horizontally long shaped prefecture and there are few affects in the mountain side. There are many snowy mountains inland.

Mt. Aizu Komagatake (会津駒ケ岳)
https://en.wikipedia.org/wiki/Mount_Aizu-Komagatake
http://www.snowjapan.com/japan-ski-resorts/town/hinoemata

It will take 6-8 hours to hike up by snowshoes.

Spring is the time for a custom of cherry blossom viewing, which involves passing through or eating or drinking under cherry blossom trees. Cherry blossom start blooming from the south Japan in the end of March and move toward the north Japan, and finally finish at Hokkaido in the start of May.

Generally, in Tokyo or Osaka, in the middle of main island, it can be seen from the end of March to the start of April. The cherry blossom in full bloom is in a moment, say only one week or so.

In this year, we enjoyed cherry blossom viewing (Hanami in Japanese) around Tokyo.

In Chidorigafuchi:

In Akasaka:

At the river side of the Meguro river:

 Visit Japan in the end of the March and you may be able to enjoy them.