Anyone looking to do some basic hitting on Weekends or some evenings

Hi -- I just moved back to Texas (Austin) for the first time in nine years from NYC.  I am currently studying for the Texas State Bar Exam, but would love to burn some energy / destress with some tennis.  I played varsity in high school, but that was a good ten years ago and I have not played much since.  I don't know my rating, and I would definitely need to warm up and get back into it.  Anyone looking for some light tennis play during the weekend or on a weekend evening?  Also, anyone know a decent and free tennis court in the area?  I live in Round Rock, but am fine driving into Austin wherever.