This is an absolute MUST if you have people visiting Vegas! Heck, I'd come here all by my lonesome just for the cheeky eclectic lighting and huge portions!
Peppermill is quintessentially Las Vegas :) It's open 24 hrs, and seemingly always packed. Located on the north end of the strip, it's not the greatest location, but convenient enough and with ample parking. They make a mean sandwich, and supposedly have amazing banana bread! The service can be a little slow, but it was friendly none the less. What I love about this place, however, is all the neon lights and it's 50's diner quirk. There is also a bar attached that has a nice little indoor fire-pit that is soooo retro fun. It gets crowded so be ready for a wait or to sit at the counter.