IMHO, Bayou Segnette State park in Westwego, LA is really nice, though it's all back in and no sewer. (Most are large and angled so it's not too bad.)
We also liked Buccaneer State park in Waveland, MS. Though, again, I think they're all back in. Full hook with sewer at all sites. (But if you stay towards the back of the park there is a train track that reminded me of the flophouse scene in Blues Brothers.)