Rex's Diner is a diner located just across the street from Davis Quartz in Blaine County, San Andreas. It is a purple and green colored restaurant, named after a large purple dinosaur eating a hotdog located to the western side of the diner. This T-Rex, which seems to be the restaurant's mascot, could be based on the real life Cabazon Dinosaurs in Southern California. Behind the restaurant are some unused containers, oil tanks, and trailers. The restaurant is inaccessible to the player and plays no role in the storyline whatsoever.
- The dinosaur resembles the iconic Novac dinosaur from the game Fallout: New Vegas. Both dinosaurs are holding something, overlooking a major highway, and are near quarries. Both dinosaurs are based on the Cabazon Dinosaurs, although the Novac dinosaur is in Nevada.
- The purple coloring of the dinosaur might be a reference to Barney from the popular kid shows.
- The diner has a sign reading "EAT", with the E partially broken, which makes it look like it says "FAT". Especially at a distance.