They have 20 miles of existing single track with some jeep trails. The trails lead through typical hill country terrain (rocky), with spectacular views, hill climbs (good ones), long downhill sections (best of all), technical single track (yes it is), and several creek crossings (usually dry in the summer).
They do have a map of the area at the main trail head and it is pretty much the main entrance to all the trails. Bring your own water and tools and a couple of tubes! They do have a mechanic stand at the trail head to work on your bike. The cost is $6.00 per person and it is worth every dollar! Fill out the envelopes (at the entrance) and frop your money in the box. NORBA has several races here every year. The downhill race is worth the trip.
FROM SAN ANTONIO, TX: <br />Take IH 10 West from San Antonio 45 miles to Comfort. Take the first Comfort exit, State Highway 27 west. Continue approximately 1/2 mile to the first flashing yellow light at the Y intersection of State Highway 27 and US 87 North (to the right). Go 1/4 mile to the second flashing light and take Farm to Market 473 East (to the right). Go one mile and take Flat Rock Creek Road to the North (left). The pavement ends four miles later at the gate to Flat Rock Ranch. Go through the gate, close the gate and park near the only cedar pole shed on the left. Please close any gate you open on the property. This ranch does have live stock, which you will rarely see.
http://www.singletracks.com/item.php?c=1&i=1486