We stayed at Mid-South RV park back in October. It was a one night stopover coming and going. It is Harrah's "RV Park". Park was fine. Cost was good too...maybe $15. We didn't look at any of the others. They have an hourly shuttle to Harrah's casino.
We made the mistake of eating at Harrah's buffet. Way overpriced and low quality.
If you stay there, you may as well drive down to Clarksdale and go to the Delta Blues Museum. Guess you could take in Beale St. in Memphis as well.
You may want to look at Paragon Casino in Marksville LA. The RV park was just a bit nicer. But, the roads getting to it are rough and there isn't much else around.
http://www.casinocampgrounds.com/dir...sissippi.shtml