Casa Azul is only a few hundred feet from the San Antonio River as the egret flies (or a few hundred yards on foot).
Upriver from Casa Azul is downtown San Antonio and the famous Riverwalk. Downriver is the much less urban Mission Trail. Let's go downriver first.
The entire Riverwalk and trails stretch out some ten to fifteen miles, which would be quite some journey on foot. Luckily there are bikes for rent.
The river has always been the center of life for San Antonio and when the Spanish colonized the area in the 1700s they build a series of missions along its banks.