Bluegrass Grill, around the corner from the Choo Choo on E Main. Diner with good home made breakfast fixins. May be a line to get in. Always a good sign
Maple Street Biscuit, downtown Market St near aquarium, next to Moon Pie store. Hearty biscuits * pancakes.
Urban Stack W 13th st. Good hearty burgers
Terminal Brewhouse market street next to Choo Choo. Brew pub fare
Public House Houston @ Market. May be pricy, but downtown workers lunch here.
Chattanooga Whiskey Distillery -- across from Choo Choo
If you're bringing the family, the aquarium complex down by the riverfront is highly recommended. Two exhibit halls, ocean and freshwater environments.