If you have no interest in dining at a regular restaurant, you're crazy hungry, and you don't mind eating dinner earlier the second day, this is really the biggest no-brainer in Vegas.
Buy the buffet pass fairly late for your first night's dinner. Gorge yourself on the wonderful options. Have another buffet at breakfast. Have another at lunch. And eat a second dinner all on the same pass (as long you you do it before your 24 hours is up).
You have to pay extra to do Caesar's Bacchanal, but it's still worth the upcharge. My recommendation would be Le Village at Paris as your breakfast option. It excels in the morning and is nothing special at other times. If you love seafood, the Rio's seafood buffet is a good choice for your other dinner. The lunch options are all pretty much the same. Bacchanal is not worth the upcharge for lunch when you consider that it will be your 3rd of 4 meals in a 24 hour period. You're just not going to get your money's worth there. So do a boring lunch one like Spice Market at PH.
All in all, there are few better options to eat 14,000 calories in 24 hours.