I assume you're heading north to I40 pretty quickly. If so, you can hit the Grand Canyon. Or, if you've seen it, go north at Flagstaff and turn east at Tuba City past Second Mesa and Keams Canyon. Turn north on 191 to Canyon de Chelly National Monument, on to 4 corners.

As an alternative, turn SE at Flagstaff for the short trip down Oak Creek Canyon to Sedona - spectacular scenery.

If that's too much off track, east of Flagstaff are 2 sights not very far from the interstate: the giant crater (remember Starman with Jeff Bridges?), and Petrified Forest National Park.

At Albuquerque, driving to the top of Sandia Peak is fairly nice. Get some relief from the heat.

You could go scuba diving at the Blue Hole - a spring-fed sinkhole with great depth and water clarity in Santa Rosa, NM. Only about a minute off I40.