The cherry blossom bloom in Japan is renowned worldwide. If you ask a local where their favorite spot to view the blossoms is, you'll likely get several different answers.
The truth is you can't go wrong with where you view the blossoms. At a temple, in the city, in the countryside, all these spots offer excellent backdrops to the whitish pink beauties.
If you're in Japan in the spring but you think you missed the blossoms where you are, search for the cherry blossom forecast. There may be other parts of Japan still in bloom you can get to with a quick Shinkansen ride.