Austin:
Counter cafe is great, would go all the way back to Austin to have their biscuits and gravy again.
Voodoo Donut, obvs.
The bar at the Driskel Hotel if you want to have some classy drinks. Whisler’s in East Austin is amazing if you want some less classy drinks.
The Mexican food is amazing, as is the barbecue but be prepared to queue if you want to go somewhere like Franklin’s or Stubb’s. I’m sure I did some stuff there that wasn’t eating or drinking but I don’t remember a lot of it.
San Antonio is nice, was only there overnight but it’s surprisingly walkable for an American city. There’s an amazing bar in the Riverwalk called Esquires. The Alamo is dead boring though.