When I visited I was most impressed by the buses surrounding it with their diesel motors running to keep the cabin cool for the tourists who couldn't walk more than 200 feet to the entrance.  I asked one of the volunteer guides  if they cared about the effect of pollution on old adobe walls.  His reply was a Texas-size shrug.

Later I visited the oxymoronic Institute of Texas Cultures.  And then the River Walk.  A security guard threatened to have me arrested because I pointed out it was against fire regulations to lock the doors of the food court next door just because the Marriott wanted to keep people away from its private party on the public walk.