best/biggest in the area I know of is St Joe State Park in Farmington MO. 2000 acres with about 800 of it being sand the rest trails. Most of the trails are big enough for a Teryx too. St. Joe State Park - Home - Missouri State Parks and Historic Sites, MoDNR
Also a place I have been to but is farther away for you is Brick's in Poplar Bluff MO. Small, only 400 or so acres. mostly trails and mud.
BricksHome