Hamamatsu Castle of the Imagawa Clan was built around 1532, and was originally named as Hikuma-jo. However, it was taken over by Tokugawa Ieyasu and renamed the castle, Hamamatsu Castle in 1577.
Now, the three-story castle serves as a very accessible local museum, displaying important treasures of the locale.
The castle is a good place to stop by.
Spring is the best time to visit the castle, on dates May 3-5, where Hamamatsu Festival is taking place, where one hundred kites are flying atop the sand dunes of Hamamatsu City (Nakatajima Dunes).
The nearest station is the Hamamatsu Station. From there, take the all line bus at bus stop #1 or #13 of the bus terminal, and alight to "Shiyakushomae".
Hamamatsu castle is open from 8:30 am-4:30 pm, daily, except on December 29-31.
Admission fee is 150 Yen.