A fun surprise was this nifty, professional-looking, unstaffed aquarium at Mammoth Spring near the fish hatchery. When the women at the welcome center mentioned it, I assumed it was going to be big open tanks of fish (like the hatchery). Instead, it was this nice little exhibit of various species of Ozarks-region fish (and fish that are being preserved/re-introduced into the area), as well as a little alligator and some turtles.