The Gushichan Castle Ruins Park, which is also called the Battle Site Park because the area was a scene of a hard-fought battle during the war, is located on the ocean coast of Yaese Town.
Map:
japanupdate.com
The boardwalk of Gushichan coast (JAPAN UPDATE)
A Boardwalk at Gushichan coast, its about 600m long and good to walking!