This botanical garden (北海道大学植物園, Hokkaidō Daigaku Shokubutsuen) close to Sapporo's city center belongs to Hokkaido University and primarily serves a scientific and educational purpose. The garden with its walking trails and lawns, however, is also a pleasant place to take a break or to have a (non-alcoholic) picnic.
Established in 1886, the Botanic Garden preserves a small part of the forest which formerly covered the Ishikari Plain. In addition, there is an alpine garden, a greenhouse and a small Ainu museum. During the winter, only the greenhouse is open to the public. https://www.japan-guide.com/e/e5304.html