I'm driving cross-country from New England to San Francisco in a few days. I'll have company all the way up until Memphis. After that, I'm on my own.
I'll be taking I-40 through Arkansas, Oklahoma, Texas, New Mexico, Arizona, and California. I'd like to have a few stops during the daytime (not too long, 1-2 hours tops) to break up the monotony. They can't be too far off of the highway. Any suggestions?