If you like good wings and pizza, BALBOA PIZZA in the District at Green Valley Ranch is the shiz!
Other than that, I heard Panevino is really good for Italian , but I STILL haven't checked it out yet.
Other good places: Bahama Breeze on Flamingo, China Grill in Mandalay Bay, White Chocolate Grill.....
That's all that comes to mind right now. In N Out Burger?