This is a truly magical place, and if you’ve ever read any of the Little House on the Prairie books and are anywhere near De Smet South Dakota, do yourself a favor and swing by.
The Ingalls Homestead consists of two main parts. First is the "campground," which is a basically a large grassy slope where you can set up your tent for just $10. It includes hot showers, flush toilets, and a few picnic tables and fire-pits throughout the field. There's also fairly basic RV parking for $30 with electric and water hookups and a dump site as well as some basic but cool covered wagons for $60. We arrived just as the sun was setting, found a lovely spot for our tent, and then paid in the shop the next morning. The bathrooms were clean, the showers were a little strange but also clean and hot (basically a large room cordoned off by several shower curtains).
De Smet is where the Ingalls family lived during the "Long Winter" of 1880-1881, and the Ingalls Homestead is a "family run business" that brings to life many activities from the 1880s such as visiting a one-room schoolhouse, making a corn on the cob doll, going on a covered wagon ride, etc. It's truly hands-on and some of our favorite time was spent hanging out in "Pa's" lean-to barn with the barn kitties and riding horses and ponies. My oldest son also learned how to drive the covered wagon to the schoolhouse down the road (another treat). Each station on the self-guided tour has an activity with incredibly nice and informed hosts. Most of the buildings are based on the original plans and descriptions from the Ingalls family, though no original buildings remain on the site. Visiting the homestead is an additional $15 per person over the age of five, and while you could camp without visiting the homestead, it was definitely worth a half or full-day visit.
Friendly folks and simple camping. Lots of things for the kids to do and play just like its 1880.