Goryokaku Park, Hakodate
Goryokaku Park is named for the pentagon shaped fort in the middle of the park in Hakodate city. The park has 1,660 cherry blossom trees. In Spring, you will notice a lot of hanami (cherry blossom viewing) parties going on. There is no admission fees to the park itself but it cost 800 yen to go up the Goryokaku Tower to see the pentagon shape.