We always use our own facilities, so have no comment or knowledge on the quality of the bathhouses at any of these. As long as it has water and electric and a close-enough-to-level parking spot, we are happy. Sewer is nice, but we can do 4 days easily without dumping.
Hungry Mother State Park (in the Fall is great). Lake in walking distance. Pics:
October Hungry Mother State Park - Virginia - David Dusenbury
Roan Mtn. State Park in TN. Pics Below
Millers in Laurel Springs NC. Pics Below
Myrtle Beach State Park -- sites in the trees (shade). Easy walk to ocean (1000'). Longer walk or drive to fishing pier (1/2 mi.)
Holden Beach Pier & Campground. Camp and fish not much else to say.
We have had a couple of good KOA experiences:
Townsend TN (near back entrance to Cades Cove, don't have to go thru G-burg at all)
Charleston, SC
Kerr Lake:
Kerr Lake State Recreation Area (Bullocksville) if you want to park right on the water but not swim or boat. Sites 47 or 48ish
If you want to beach a boat, Hibernia or Henderson Point
Privacy, more low-key, not crowded, ramps and dock space, Steele Creek marina & campground
Roan Mtn State Park in TN. Easy few mile drive to Carver's Gap hike for sunrise. Paved sites. No lake or ocean, but absolutely fantastic pizza in town.
Miller's Family Campground in Laurel Springs NC. Get a site up on the ridge (like #63) and the view is good. Again, no lake/river/ocean, but relaxing.