In 24th March, Cherry blossom (Sakura) has reached full bloom in Tokyo. It was 2weeks earlier than usual.
Shinjuku-Gyoen, one of the largest park in Tokyo, was full of visitor who enjoyed cherry-blossom viewing.
Some cherry blossoms bloom lower than other park so you can take a good picture.
If you go there, I strongly recommend that you should enter from Sendagaya Gete.

Most people use Shinjuku Gate so it is very crowded like following picture. When I used Sendagaya Gate, I only waited 5 minutes to buy a ticket.
Let’s enjoy Cherry blossom season!