FUN THINGS TO DO FOR FREE OR UNDER $5 IN SAN ANTONIO McNay Art Museum: Every Thursday, the museum has free admission for adults from 4 to 9 p.m. Kids and teens under the age of 19 are always free. Additionally, students with an ID from Alamo Colleges, Trinity University and the University of the Incarnate Word also receive free admission. McNay Art Museum, 6000 N. New Braunfels Ave., 210-824-5368, mcnayart.org.