Spring Lake Park is Williston's main green escape, with water, trails, picnic areas, and family recreation on the edge of the city. In a prairie oil town, that combination of shade, paths, and open space is useful for visitors as well as locals.
It is best for a leg-stretching walk, a picnic, or a low-key afternoon outside. Do not expect a wilderness experience; the appeal is accessible nature close to town, especially if you have been driving long distances across western North Dakota.