Shimoda Park is a natural park located on a hill overlooking Shimoda Port in Shimoda City, Shizuoka Prefecture. This site was once home to Shimoda Castle, the largest mountain castle on the Izu Peninsula. Remnants of the castle, such as moats, still remain in the park, offering a glimpse into the past. The park boasts a variety of flowers throughout the year, with azaleas in spring, hydrangeas in early summer, and camellias in winter, delighting visitors. In June, the "Hydrangea Festival" transforms the park into a vibrant sea of colorful hydrangeas. Shimoda Park also holds a significant place in Japanese-American history. In 1854, Commodore Perry's Black Ships arrived in Shimoda, leading to the signing of the Japan-U.S. Treaty of Amity and Commerce. A monument commemorating this opening of Japan is located within the park, reflecting this historical moment. Furthermore, the opening square features a monument commemorating former U.S. President Jimmy Carter's visit to Shimoda and a monument to former U.S. Ambassador to Japan, Mike Mansfield, highlighting the history of Japanese-American exchange. Shimoda Park is a captivating blend of nature, history, and international relations. When visiting Shimoda, be sure to visit Shimoda Park and experience the rich history and natural beauty of the area.