Typically, during the last week of March is when you can view the cherry blossoms in full bloom around Tokyo, Japan. This cherry blossom tracker is a great resource each spring to see the expected blossoming time by region. The blooming times vary each year which makes it hard to plan correctly ahead. If you are fortunate enough to be in Tokyo during the blooming time-frame, then definitely take advantage of it. Here are a few suggestions for viewing spots based on personal experience.
Shinjuku Gyoen Park
This park is located in the heart of Shinjuku and features a large amount of cherry blossom trees. There is a small admission fee to enjoy the large park and its multiple gardens. You should definitely take your time and enjoy the beautiful landscapes in Shinjuku Gyoen Park.
Another great park with wonderful cherry blossom trees is Ueno Park. This park is very popular for picnics during cherry blossom season. You will find a large crowd of people in the park spending time with friends and enjoying the blossoms. The park also contains multiple national museums and a zoo. They are all worth visiting if you have the spare time.
A park located along the Sumida river covered with cherry blossom trees. It is a great place to stroll through. The trees are also illuminated in the evenings during Cherry Blossom season. Also, Sumida park is a less than ten minute walk from Asakusa Shrine.