There is a small Ouachita National Forest Park called Crystal west of Hot Springs on Highway 27.
Visitors wander around in search of exposed crystals.
It's about all there is to do there, but it is habit-forming. After awhile, your body takes on that crystal-hunting position as you look for that really great crystal. From Crystal, it's an easy drive around Ouachita Lake that is lined with Corps of Engineers Parks , a state park , and other national forest parks. Charlton National Forest Park is worth a stop. Ouachita Lake itself is great for canoeists with shallow inlets for easy docking.