From Austinbike.com:<br />
The trail is rocky and changes up quite often, from dirt and rock to rock and rock. There is not a lot of climbing, most of the climbs are short, but there were a few that really made me wheeze. The technical level varies from medium to mildly difficult, but there is no reason that a beginner couldn't take on the trails, and an expert will never be bored.<br />
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Update: As of 5 June 2010 the REI/Austin Ridge-rider's trail project is complete and blessed off on by the Corps of Engineers. The entire loop around Lake Georgetown (Goodwater Trail) is now open to mountainbikes. Trail length is now 26 miles.
From Austinbike.com<br /><br />Lake Georgetown's Overlook Park:<br /><br />Overlook Park has the trail head that is closest to I-35. Take I-35 north and exit 261A, Williams Dr./2338 for Andice/Granger. Take a left heading west on 2338. Go about 4 miles and turn left on DB Wood Rd. The HEB will be on your right after the turn. About .5-mile later, take a right into the park. The trail starts at the bottom of the hill next to a large boulder as a crushed stone path. About 50 feet down, it crosses a faint doubletrack and the singletrack veers off to the right. Do NOT take the crushed stone path. Distance to Jim Hogg Park is 2.9 miles. <br /><br /><br /><br />From 183: Take 183 north to Seward Junction at Hwy. 29. Turn right heading east on 29. Go about 10-12 miles and turn left on DB Wood Rd. Go about 4-5 miles and turn left into Overlook Lake Drive and Overlook Park.<br /><br />
http://www.singletracks.com/item.php?c=1&i=1815