Things to see in San Antonio besides the riverwalk

Do the Missions trail.
You can rent bikes along the way, and the route goes along the river. The missions are just amazing.
Also the Alamo is not to be missed.

Barney Smith's Toilet Seat Museum
World's Largest Cowboy Boots. North Star Mall
Buckhorn Saloon and Ranger Museum
Rowdy the Roadrunner
US Military Dog Monument
Lackland Air Force Base
Wooden Nickel Museum
The Pig Stand @ 1508 Broadway Street
The Alamo
Menger Hotel
And if you like golf - there's always Monster Mini-Golf

Need more? I have more...just ask...:B...Dennis

Restaurants. Puffy tacos.

Do a Google search for San Antonio tourism.

If you like basketball go see a Spurs game.

Just off the top of my head - go/do

Trail of the Missions
Mexican Market area
Lone Star Brewery and Buckhorn Hall of Horns
Sea World
Alamo
Zoo
I don't know how many museums..

Just type in San Antonio in the search bar.

What time of the year are you planning?