One of the larger and nicer malls on the West Coast, the upscale Fashion Show has everything except a real book store (Borders Express doesn't count). It's very modern-looking and clean. My favorites are the Apple Store, Tommy Bahama, the very large Macy's, and Z Gallerie. It's extremely convenient for anyone staying at Wynn or Treasure Island.
There are a couple of negatives: the cart vendors are annoyingly aggressive, and due to the length of the property it seems many foot visitors from the Strip never make it as far back as Dillard's. And it the odd placement of the escalators can make it difficult to get up or down a level quickly .