We live about 30 min. from Sardis and have been there many times camping. We also have Wall Doxey State Park it's nicer then Sardis but no swimming. We have a 7 year old and he loves to swim in the summer so in the fall we go to Wall Doxey.
My sister lives in Long Beach not to far from you, in fact you don't happen to work at Stennis, my brother in law works there and met someone the other day that had a vintage Airstream.
Lets see if anyone else from Mississippi joins in and we will see if we can get a rally up.