I'm in a similar situation to kaylaraine. I'm attending a wedding in Dallas and have some extra time off. I was thinking of driving to Austin because everyone says there's more going on there than in Dallas, but all I can find besides go see the bats and go listen to some bands is way out in the country (Pedernales Falls, Enchanted Rock).
So here's what I'm wondering: I'm planning to drive from Dallas to Austin after I fly in around noon, and I'm not planning on doing much that evening besides seeing the bats and maybe going to see a band. I'm allowing myself the next day to get from Austin to Fort Worth (I'm hoping to see a rodeo at 8 pm that night). Is there anything in Austin proper I can do? If I leave Austin first thing and go to the natural areas I just mentioned is it worth it? Google estimates drive time would be over six hours, so I don't know if I'd even have time to enjoy the parks. Should I just stay in the Dallas/Forth Worth area and take in Billy Bob's and the stockyards?