Hey David,
I am new to this board also. Have you tried Lake Perry? It is a small lake but has alot of Crappie. When I lived on the Coast My Wife and I used to go there alot it was nice. If you camp they have a nice campground and have boats for rent for only a couple dollars a day. It is on Hwy 98 in Perry County.
Its only about 30 minutes from Hattisburg. let me know if you tried it and if they still biting. Good Fishing