When staying or going through Amarillo, try the Big Texan Steakhouse. Yes, it's unabashedly over-the-top touristy in the tradition of roadside attractions, but if you have a sense of humor it is darn fun...and the steaks are great! If you stay in an RV park, they'll send an old caddie limo with a set of longhorns on the hood to pick you up gratis (camp host will arrange it for you); just tip the driver. You don't have to be a Yankee or Canadian or German to enjoy it. Shoot, we're as Texan as they come (TexaSecede!) and we love going there too.
