If any monkeys are in town check out the only worthy park in ATX and the surrounding area, new stuff being built all the time. Bout 5 miles of downhill riding, burms, tabletops, jumps too scary for little ol' me to comprehend. Daily ride fees or memberships are available. Check out the website, not too much more about mountain biking on it than what is here....
http://twinparkscountryclub.com/mountain_biking.htm
Peace
http://twinparkscountryclub.com/mountain_biking.htm
Peace