Overnight: Approx 5 miles south of interchange I-40 and I-25. Heard there are some elect. hookups but can't confirm. Free
Casino Camper Research: Thanks to the tip from Tony K. above I did some research on this one. Sounded like a good deal. And it seems to be. There's a lot next to the casino where you can park for free, and there are even a few electric outlets on a first-come basis. Reports vary from 4 to 6.
The Islata Pueblo area is quite large and includes the Islata Pueblo Recreation Area a fishing lake and RV park at the lake. Not sure how far this is from the casino