Not sure on all the places you’d consider or are interested in but I believe the highest rated restaurant is Joel Robuchon at MGM Grand. As you are probably familiar, it’s expensive but generally worth it for those who are into that sort of a dining experience. The issue would be getting a reservation but try asking a casino host at Aria they might be able to help. Outside of that one, could look at other nice places but not in that same category. I can vouch for Amalfi at Caesar’s. The space is vibrant and the seafood/Italian menu is fantastic. Would definitely fit into the fun night out category with great food but not into the super high end experience. If you wanted more of the fun experience and I’m not sure on the food these days, could look into The Foundation Room at the top of Mandalay Bay. It’s been years since I’ve been so I can’t say on the food quality but the view hasn’t changed and it’s pretty cool. If you wanted to mix it up and grab an Uber, check out Vintner Grill in Summerlin. It’s pretty much the nice locals option for folks who live out that way and it’s a solid spot.