Fort Sill has a lot of history to view. Great museums. Full hookups. Close to MT Scott and wildlife park. You can reserve a spot online but they will not save your spot for you. I visit yearly and have never gotten the spot I reserved.
Well, the sites are very basic and there is a lack of trees. But there is a nice sandy beach area, waterslides, paddle boats and kayaks for rent, a restaurant and a playground in the camping area.