You can see very beautiful cherry blossoms along the railroads of Chuo line, from Iidabashi Station to Yotsuya Station.
It is about 2 km walking.
Get off at Iidabashi Station.
You can walk along the promenade....
while seeing many trains crossing.
You can also enjoy fishing at fish pond next to Ichigaya Station.
There is a restroom at Atre Yotsuya shopping center connected Yotsuya Station.
If you'd like to go Chidorigafuchi, you can get to a subway from Iidabashi or Ichigaya Station to Kudanshita.
Each of them is the next station.