This is a slightly more upscale version of the Cheesecake Factory, open 24 hours a day with a huge menu that makes suggestions difficult.  There are two locations within the V/P complex, the link here is to the one in the Venetian.  Prices are reasonable for Vegas and its one of the better options at 3am, but not worth going out of way for.

Casual spot with all the classic Italian dishes you would expect.  Prices seem to vary a bit between lunch and dinner, with sandwiches available during lunch.  On Sunday they offer a brunch buffet that will fill you up to start a Stumble along with botomless drinks for an additional $20.  

Orange tree bar at the entrance to an interesting / immersive dining area make this an interesting and fun spot for any meal.  If timing wokks hit up their Samba Hour, otherwise they have a good size menu of options from Sushi to grilled meats and more.  Good spot for sharing stuff for a meal or just to grab a snack although it's a bit out of the way in Palazzo.  

Highly rated spot with a good people watching bar & excellent cocktail menu.  The chicken and waffles is the focus here and makes for a good meal to split if not ready for a full meal.  If going during dinner hours and want a table, it's suggested to get a reservation.  The bar can be tough to get a seat at as well especially pre Sphere shows or when a convention wraps up for the day.

A spot that sort of feels hidden despite being next to a food court in a huge hotel complex.  Reasonable prices & always excellent service in a casual location.  Only downside is they charge if you cancel a reservation which is needed at times on a Stumble.  While your walk in chances are decent, it's suggested you book a time an hour or two out once you are en route vs booking too far in advance. 

Suprisingly good Mexican food in an Italian themed resort.  Nice seating overlooking the indoor gondola rides.

Consistently called out as one of the top burger spots on the Strip, but especially known for their "Crazyshakes".  They do not take reservations and there is often a line / wait for a table, but easier to grab a seat at the bar.

Upscale spot for dinner that offers a quality daily brunch option and excellent drink menu.  They have a lively bar in a good people watching spot if stopping in for a snack or casual meal.

Located in the St Marks Square area with "patio" seating, Brera offers quality Italian food in a lively setting.  Reservations are suggested here especially for dinner, but walking in for lunch or sitting at bar should not be a problem.  They also have a popular Happy Hour to check out if only looking for a snack.  The menu on website does not include prices.  Assume apps & pizzas around $20, with pasta dishes a bit more & entrees in the $30 - $40 range.

Daily brunch with bottomless mimosas offers a good spot to start a Stumble.  They have a good size menu with everything from basic breakfast to sushi rolls & a raw bar.  Place can be busy, but usually not too long of a wait if you don't book a reservation in advance.

Your classic red & white checkerboard table cloth pizza spot serving up evertything you'd expect.   This is a bit out of the way in the restaurant area of Palazzo, but a good option if in the area.