Select museums and historical sites around San Antonio will be offering free admission with coupons!
This is actually a national promotion, so you can view an entire list here of participating venues. But the three participating here in town are:
I think free admission to the Institute of Texan Cultures will be the big draw here in town -- it's a lot of fun to wander the outdoor exhibits. Plus, admission is normally $8 per person, so this is a big savings too!
You can snag one ticket per household for up to two people -- so if you have more kids or adults than that, consider sweet-talking a friend or family member into registering and attending with you for extra spaces.