Kōshinan Historic Park is a small Matsuyama site tied to the city's literary and haiku associations. It is quieter than Dōgo Onsen or Matsuyama Castle, but it fits the city's identity as a place where literature and everyday urban walks overlap.
Visit if you are following Matsuyama's haiku trail or want a short, reflective stop between larger sights. The park's value is contextual and atmospheric rather than grand.