Maybe meet up somewhere for dinner and then wander the Riverwalk? I live about 50 miles away but unfortunately I don't really know that much about what there is to do in San Antonio other than see the Alamo, go up in the Tower of the Americas, wander the Riverwalk, or the whole Fiesta Texas/Sea World thing.
Ok, so maybe I know more than I thought...
It may have to wait until September - I just moved to a new apartment and I'm running short on funds.