This broad historical site is impressive from the outside, with long, high walls surrounding a tall, restored cathedral. Boasting numerous rooms and displays, the site shares much about the history of the Spanish missions in Texas. Most to all of the walls are reconstructions, I believe, but the majority of the cathedral, itself, is original.
It was a muggy morning but the sun actually remained at bay for a mid-August morning. I stayed about half an hour walking around the property, peeking in rooms and taking photos. Park staff were putting out reconstructed period items for tourists to handle and two tours were being conducted as I walked around -- you don't have to be part of a tour group to wander the property, which is free to the public.
Two girls were on the property getting their photos taken -- the first I thought was a bride, but the second's dress was so peacock blue I couldn't imagine it was for a wedding, but hey, I've been wrong before.
If you're looking for an historical activity, this is perfect to the San Antonio area, only 5 miles south of the Alamo (which is considered a San Antonio mission), which is in downtown along the riverwalk, and two miles south of Mission Concepcion, this is a great spot to go.