Originally Posted by CMK10

Never hurts to stop in old Las Vegas. I-15 will take you right from there to San Diego too.

Plus there's Canyon de Chelly in Northern AZ pretty close to I-40. It's almost as beautiful as the Grand Canyon but less crowded:

www.nps.gov/cach/index.htm

If you get down Amarillo, TX way (on I-40) there's the Big Texan Steak Ranch..always a fun place to eat and site of the first ever Man vs. Food challenge:

http://www.bigtexan.com/