After stuffing my face with a huge lunch, I decided to take a river taxi up the San Antonio River to the last stop at the Pearl Brewery.  It was a lovely trip!  If you go, expect to see tourists, other barges, bridges, plants, trees, flowers, ducks, turtles, a lock which raises your boat to the upper river level, waterfalls, and plenty of sunshine!  If you are feeling energetic, you can even step out along the way and go for a hike along the Riverwalk path.