Mountain Biking DORBA Trail at Cedar Hill State Park (Dallas, TX) 

Cedar Hill State Park is only 20 miles southwest of Downtown Dallas. There are about 12 miles of MTB trails in the park which are named and maintained by Dallas Off Road Bicycle Association (DORBA). These trails are configured into 3-, 8-, and 12-mile loop which are well marked. The trails have lots of short (and sometimes steep) climbs and descents and are mostly smooth with lots of roots though. There're also many wooden features built for fun but also for flooding/mud issues.