Whenever I told anyone we were going to San Antonio they would invariably say "oh, you have to go to the riverwalk and the Alamo" So we did. We started at the IMAX to watch the Alamo movie to set the stage. It was made with historical re-enactors and not real actors. Then on to the Alamo. I didn't get any pictures of the Alamo but we enjoyed the history. Photos are actually prohibited inside and outside difficult to get a shot with all the modern amenities.
Riverwalk was a bit of a disappointment but that could have been just how much everyone had built it up. It is beautiful. The banks are lined with restaurants and the odd gift shop. And waterfalls and flower gardens. There are lots of little footbridges so you can cross to the other side.
This is the underside of an underpass.