Also in Clarksdale, stay at the Riverside Hotel, where Bessie Smith died when it was a hospital. I did it in 1996 as part of a blues pilgrimage where I drove about 2,000 miles around Mississippi - most of that was getting lost and backtracking. None of the locals had heard of any of the bluesmen we know and love.
Clarksdale also has (had?) the birthplaces of Sam Cooke and Ike Turner. I believe Morgan Freeman lives there now, and owns a bar. The town was pretty run-down when I was there. IIRC, its rebirth was recounted in the NYTimes or some other august publication fairly recently.
I also did lots of graves in MS - Fred McDowell, all the Robert Johnsons, Charley Patton, Sonny Boy Williamson, etc.
There is (was?) also the Dockery Farms plantation, the former site of the Three Forks store where Robert Johnson was poisoned. BTW, the location of the current Crossroads is different from where he sold his soul. I went there at night, of course.
Beyond that, the Mississippi hill country - Oxford, Hollis Springs - is a beautiful drive.
Try contacting this chap, Jim O´Neal. See if he has any more Delta Blues Map Kits for sale. I bought mine from his now-defunct shop in Clarksdale:
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stackhouse-bluesoterica.blogspot.com]
Also, the Robert Palmer/Dave Stewart Mississippi blues docu Deep Blues is essential viewing, though most of its participants are dead now.