Tokeiji (temple) is one of th best spot to do ume viewing. Along the street inside temple, you see ume with blooming beautifully. There are not so many trees though, just you feel Japanese traditional cultures.
Basically, early to mid March is the best season and easy to access from Kitakamakura station.
Really nice contrast with Japanese roof
A road line with trees
Address: 1367 Yamanouchi, Kamakura
Closed: Open everyday