Capt Karls Night Time trail running series- I'll be trying these Summer 2014. I've heard great things and can't wait to start!
lost maples state natural area trails
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Nice set of trails combined with water crossings, hills, and varied terrain.
Enchanted Rock, loop trail approx. 4 miles; summit trail approx. .6 miles- Have not been there yet but looks like it is worth the trip
Lost Maples State Natural Area- Vanderpool, TX approx. 13 miles of trails
Trails are not technically difficult and are paved or compact dirt. Lots of shade and lots of people using the trail system. Restrooms available at the parks along the way.
Tejas Trails- These guys put on trail runs throughout the year from 10k's to 100 milers. Bandera, Rocky 50, Nueces, Wild Hare, etc. Races are well supported and the terrain is challenging. Check them out!
Hill Country Trail Runners- Great source for trail races in TX. Lots of links to other sites that put these races on and links to trails
San Gabriel River Trail- 26 mile rugged trail winding through dense Juniper Forest, Hardwood Bottomlands, and Prairie Grasslands . The trail extends completely around Lake Georgetown via the dam.