The offers we're familiar with are property specific. So, your Aria offer would only include the restaurants within Aria.
Although unusual, our Excal offer included food in Luxor (not surprising....sister properties....share the same President) and MB (very surprising....many good restaurant choices). Once again, this is not the norm.
Your play may dictate a host opting to pick up off property charges but don't expect them to be automatically covered as part of your offer. A recent change is that on your folio when you sign in you may find small print that tells you which restaurants are covered or not. Also, confirm if it's a fixed amount per visit or per day.
We've experienced the full gamut of options and it's important that you ask the pointed questions when you check in to avoid surprises when you check out.
As for the OP, I guess my suggestion would be based on how much alcohol ate into this amount. If I were there on a Friday or Saturday, I would opt for lunch on the patio at Olives. The fountain show starts at noon on these days and it's a great viewing spot.
On Sunday, I would opt for the Jasmine brunch. Not cheap at $58 pp plus if you include Champagne. This would be my only meal of the day.
You recevied many other good suggestions but some of these would gobble up the whole $200 at dinner. Recommnedations include Shibuya (sushi/tepanyaki), Nob Hill, and Craftsteak at MGM. There are prix fixe menus for $50 pp at many of the Mirage restaurants and I'd recommend Onda, Stack, kokomos, and Japonais.
The bottom line is that you'll run out of food credit before you run out of choices. Enjoy!
Dan