Shinjuku Gyoen National Garden
I arrived in early April, originally searching for Cherry Blossoms but it came in Japan early this year. I tried looking for them and i found some but most where already gone so I was left with other trees that were pretty nice.
I hung out at this park for a few hours. It was very well packed but everyone was very considerate and not very noisy (unlike most other parks I have been to in the US).