Rivers in urban areas take a hammering - they are straightened and concreted, trees are removed from their banks, pollutants from roads muddy their waters. It is very hard to retain a natural environment.
But urban rivers can at least be treated as assets for the benefit of residents and visitors. I doubt many cities have done this as well as San Antonio in Texas.
Descend a few steps from the searing heat of the streets and you enter a magical world of water, trees, and cool pathways. Cafes and bars line the banks, tourist barges glide along the water and under bridges, pathways and steps beckon you on.