I would recommend the Al Unser Racing Museum. When we went we were able to find a Groupon so it was cheap to go. Not only is there history of the Unser racing family with cars and even Indy trophys, but also a car museum.
We also enjoyed the Gillman Tunnels up on NM4.

For "Cheap" food try Pit Stop 66. It is actually a gas station mini-mart across the 40 from Route 66 Casino (not affiliated). Get the Laguna Burger!! Might be the best Green Chili burger in New Mexico. (At a gas station??? Yep!)

Another interesting eating place is the
Frontier Restaurant.
It was featured on Man Vs Food. It is cheap but good! Right across from the University.
Enjoy!
Brian
BTW you can read about some of these on my travel blog....