Parks Similar to Buffalo Point, Arkansas??

Unfortunately, I don't think you will find anything as clear as the Buffalo that far south. In Arkansas anything south of Hot Springs is going to be pretty flat and therefore will have murky waters. I don't know about MS or AL.

In editing I need to correct myself. That is in the eastern half of the state. If you go further west there are the northern parts of the Ouachita and Little Missouri River which are also clear, but that would not help you with your distance.