Crystal Cove Park, nestled in a South Sioux residential area, is a cute park well worth a visit! What is Crystal Cove Park? Crystal Cove Park is one of South Sioux City's premier parks, consisting of a 33-acre lake inside a 100-acre park! The park is free and open to the public. The park is home to more than 200 species of birds and other wildlife. Where is Crystal Cove Park? Crystal Cove Park doesn't actually have a specific street address, but for GPS etc. purposes, it's closest to W 39th & Timberline Drive in South Sioux City, Nebraska. There is lots of free parking in the parking lot at Crystal Cove Park. Trails and amenities at Crystal Cove Park Crystal Cove Park has about 1.5 miles of trails, looping around the lake, but that's far from the only thing to do at Crystal Cove! Some other features visitiors love at Crystal Cove include: Disc Golf course : my family has played the first 9 holes, but it got too buggy for us, so we bailed before the second nine.