There is a wide shared use granite trail with a network of singletrack. You can introduce a friend to trail riding and get soem nice singletrack with some long ascents and short technical sections all in the same outing.
From Austin go west to Lakeway. Take Lohman\\\'s Crossing off of Hwy620, past the main interesection with World of Tennis Blvd. and look for the parking lot on the right.
http://www.singletracks.com/item.php?c=1&i=2295