If you only want to enjoy springtime in Tokyo, the best place to go from April to May is Showa Kinen Park in Tachikawa. For a while you will think that you are in Europe with the variety of tulips right in front of you. Tulips are much more beautiful when they are not fully opened. The park names all kinds of tulips but I was lazy to take down notes. here's my blog : http://www.totomai.net/2014/05/bloomsville.html