If you plan to eat in Samaipata (after a visit to the cascades and/or "El Fuerte", "Descanso en las Alturas" is certainly the place to go.
The place is nice, you can eat on a lovely terrace, there is a large choice of pizzas, local food (including llama), etc...
Inside, a lot of business cards of people all over the world that ate in this place.
Last, but not least, the owner is a very nice person, born in Argentina, with a strong personality.
Favorite Dish: Pizzas are good value, chicken is good as well, and Llama meat.