Just Googled this information
Old Tunnel Wildlife Management Area 1-866-978-2287 ( Hill Country area)
Eckert James River Bat Cave Mason
TX www.nature.com
Devils Sinkhole State Natural Area
TPWD, SW of San ANtonio
Clarity Tunnel, in Caprock Canyon State Park,
TPWD, e of Amarillo
Congress Ave Bridge, Austin
TX
Frio Cave, Concan
TX 830-866-2320
There was a cave on the campus of SWTSU ( San Marcos), on west campus near College Inn dorm, the Home Ec buidling, and the cafeteria. Not sure if it was destroyed building parking lots or not, It's been a while since I was there.
We would love to go see some bats but they are usually far from town and it turns into a late night. Haven't gone yet. Let us know if you get to go see some.