Locals do not go to the River Walk until someone visits There is nothing wrong with it. It is certainly fun and impressive, but it is mostly a tourist attraction. It has grown and sprawled so much that there are now "non" tourist areas.
I have lived a lot of places and I have been all over the world. The San Antonio area is not perfect and not for everyone, but it is home. I love it...mostly.
One of the coolest things going on, is they are turning most every creek into a park with clear and paved paths. It is getting to the point that you can walk end to end and side to side and loop around. It includes the River walk. Functionally the River Walk will eventually wind throught the entire city. Keep in mind, San Antonio is the 7th largest city in the U.S.
The map gives you a sense of the scale.