I guess I was thinking that since I'm in Texas, I'd like to have something that I absolutely can't get at home.
Good thinking. Okay, for a slightly dated source of info on CFS, see this article
. The article only covers Dallas proper, not the northern suburbs, so it doesn't include Babe's Chicken Dinner House in Garland, which makes a reliably great CFS
and offers a wonderful slice of authentic Texas kitsch. It's about 6 miles from your hotel--virtually walking distance, by Dallas standards--but closer than any of the good options within Dallas (and still damned good).
For barbecue, the closest good option will be Meshack's Bar-B-Que Shack, also in Garland. Here's a report by Daniel Vaughn
(the most authoritative source on north Texas barbecue; rely on him if you're considering other options). Meshack's, like most barbecue worth a damn in Texas, doesn't have dinner hours, so plan accordingly.
For Mexican, the closest good option is Cuquita's (on Spring Valley). Skip the Tex-Mex dishes, which aren't very good. Stronger dishes include lengua en salsa, costillas en salsa verde, pozole, menudo (weekends only), queso flameado, etc. Fresh, handmade corn tortillas and one of the best horchatas in town. While you're in the area, you can swing by the adjacent Fiesta and (better) El Rancho