Cave-Spring along the Current River. Not too long ago the only access to this beautiful location was from the river. Recently some nice folks built a really great trail (~5 miles round trip) that starts at Devil's Well (another great Ozark exemplar of karst topography).
Trip down I-44 in Missouri : News The Fugitive Beach in Rolla is an old quarry that has been turned into a tourist attraction. You can zoom down a 60-foot slide or jump off 15 or 20 foot cliffs. Or just take a swim, float or play volleyball on the sand beach.