For the more adventurous out there, there is this short, free VR (virtual reality) experience going right now at SXSW:
http://www.catatonic.co/
This one is not for the squeamish. If you've never put on a VR headset before, consider first stopping at the Samsung VR experience, located at 333 East 2nd (they've taken over Micheladas during SX) for a more mild, mainstream experience.
The light rail train and Austin B-Cycle offer easy ways to get in and out of downtown without getting stuck in your car.
Have fun!