The cherry blossoms bloom at differnet times in different parts of the country. I was talking to a fellow ex-pat the other day who said this is his favorite time of the year. I agree—it's pretty great.
When they are in full bloom, people pack lunches and bring booze and have pinics under the cherry blossoms. It's incredibly relaxing and enjoyable, and I can't wait for hanami—or cherry blossom viewing.
The above photo was taken at a public park quite a long way from where I live. Nice place.