Cache is located just to the north of the Sioux Falls Regional Airport along the Big Sioux River area and the City of Sioux Falls bike trail. There is no room in the cache for a pencil, so be sure to bring your own. Please place the cache back as you found it as there is no need to make it more difficult than it already is.
Also, while in the area enjoy the view of the planes landing and taking off. Cache is located in the glide path of runway 21.