Pecos National Historic Park in Pecos New Mexico, just outside Santa Fe. I think they now have daily tours of the ranch house. It is also a very interesting place, with history stretching back to Paleo-Indian times, including one of the few Civil War battles in the western states (Battle of Glorieta Pass).
The ranch house is on a small bluff overlooking the Pecos River, which starts in the mountains nearby and runs all the way into west Texas.
Sounds nice. I don’t want to tour it, I think I want to buy it and live there. :)