It's almost impossible for me not to carry a rod tube with 2-4 rods, a couple reels, and some flies. If there's people, there's water, where there's water there's fish, and where there's fish, I want to be fishing. Although my wife doesn't always agree with this line of reasoning, she tolerates my carrying gear fairly well. No whether or not I manage to use it is another story.
I don't know about fishing the San Antonio River...but I do know that County Line BBQ, right there on the river walk, has the best ribs and coleslaw you ever ate. And plenty of it too. And their beer is as cold as a banker's heart. I am in no way affiliated with them. Just a huge fan. And let me tell you a little secret if you ever visit there in the summertime. Go to County Line BBQ and sit outside. You need to face away from the river, and look towards the stone stairs. The view that goes up and down those stairs is spectacular. Far more interesting than the little dinky algae infested river. Tell your significant other that she deserves the best view and face her to the river so you can watch the steps. Trust me on this. And hey, keep this to yourself.