There's little to recommend in Vegas outside of hotels and casinos but a few choice spots are oases in the dessert if you know where to look.
Pinoy Pinay is a great place for lunch on the cheap, even if Filipino food isn't your favorite. At $8.25 for two entrees, rice, and soup it's great value especially if you've just blown serious coin on a Vegas buffet.
I got the Dinuguan and the Longanisa last time I came here. The first is a black colored stew made from duck and the second is a reddish meat sausage; both are tasty if a bit tough on your arteries.
If they offer you soup, take it! It's usually made from Sinigang, a light meat-based broth usually containing pork.
The restaurant is a bit older and kind of isolated. Filipinos in town converge here but the staff is super nice. Don't be afraid to ask questions if it's your first time.
It also doubles as a quick-stop bakery for some fresh ethnic snacks and they even have Halo-Halo! An extremely sweet shaved ice treat.