First off: prepare yourself for the taxi line. It can easily be an hour long no matter what time you get in. Might be worth a car service depending on your budget.
That being said, any airport that has slot machines throughout is A-OK in my book. Plus, in the Delta terminal there is this magical place that will give you a massage before your flight. The perfect thing for your hangover!
Restaurant options are slim pickings...but you're in Vegas, chances are you aren't going to eat when you land and you just need a greasy burger for that headache before you leave!