Located in South Sioux City, Crystal Cove Lake is a public area with a park surrounding the lakeside. Activities include boating, fishing, and picnicking. As well as hiking and biking around the water's edge. The park is roughly 60 acres in size, with the lake occupying a large portion of the space. Though not a large body of water, the lake is spacious; allowing room for paddling - especially since non-motorized vessels are prohibited on the water.