First thing go to Mi Tierra. Not too far from the Riverwalk area, 218 Produce Row next to El Mercado. El Mercado is a big ole Mexican marketplace you can kill a bit of time in also.
Go at lunchtime. (Sets you up for a good siesta). Order the cabrito with cerveza.
You will thank me and you will be on your way to loving San Antonio.

Man, I haven't been there in years.... maybe I should meet ya there!