Climbing is good fun, and it works out well that the UT gym has a climbing wall. Add an odd weekend in the greenbelt, and Austin supplies enough rock to keep any intermittent climber psyched.
Cricket. I constantly overlay the scene around me with a cricket field. Preparing for and playing in Inter-IIT cricket matches form some of my greatest memories of college, and joining the Chargers in the Central Texas League has been a fun way to get back in it.