OKC-Huntsville, Al

I will be traveling to Huntsville, Al on thursday and will return on sunday
night.  I'll be driving through Arkansas and then down through Tenn/Miss then
on to Alabama.  Are there any notable places of interest along the way?  I'll
be traveling with a 4 year old we are going to go see my wife who is in school
for work.  I plan on going to the Air/Space museum Huntsville but other than
that anything?

Thanks,
Charlie