Campground bathhouses: the best deal going
If you're camping anyway, this is the easy win. South Carolina state park campgrounds have bathhouses with hot showers. Table Rock State Park, for example, has hot showers convenient to both of its campgrounds. Book a campsite and you've got a hot shower included. In the national forests, Cherry Hill Recreation Area near Walhalla has flush toilets and warm showers for campers. It's open April 1 through October 31 and takes reservations. Most other forest campgrounds are primitive, so don't count on a shower once you head deep into the woods. Army Corps campgrounds on Hartwell Lake have comfort stations with showers too. Coneross Park has four with showers, and Springfield has four.