Lunch at this restaurant was included as a part of a Sacred Valley Tour.
But, a member of our goup had his camera stolen, though the restaurant was virtually empty. Discussion with our guide and area officials raised much suspicion relative to staff involvement.
To be fair, the buffet food is acceptable, but you should demonstrate extreme caution if you eat at this restaurant.
Finally, drinks not included were very, very expensive, 100%+ more by comparison with other restaurant options experienced on our trip. A coca cola that might cost S./2-3 elsewhere, cost S./4-5 at Casa Grande.
If in the United States, we would refer to Casa Grande as a "tourist trap".