I like to eat Schilo's for breakfast if I'm nearby. https://schilos.com/
We ate at Little Red Barn last year. Food was good. It's the waitresses there and the atmosphere. Cattle brands on the walls from all over Texas. The waitresses wear skirts and boots, sometimes hats, very 1960's. Not fancy, casual family dining. https://lrbsteakhouse.com/
We've been going down for business every year and I'm all about NOT GIVING A FUCK about anything related to the Riverwalk. Yeah, there's Mexican food and margaritas, they are expensive and on par with just about every other Mexican restaurant you ever ate at. Seriously, you're getting the same shit you'll get at the Mexican restaurant back home. It's hot in August and those friggin Mariachi's drive me nuts. Loud and annoying. If you've never been, go once, and you'll be done.
We try to find places out of the way. We had an airbnb near the hemisfair area so we could drive around a bit. I ended up having a business dinner at Rosario's on Alamo St. It was ok, but expensive, parking sucked. Supposedly they were changing locations. It ended up being a pain in the ass too.
There's also a little dive place we go to called Bud Jones. Nothing fancy, basically diner type food, but we always leave full.