Awesome place to stock up on all the essentials before you begin your stint in Vegas! And one of the least expensive meals you'll have there (if you're staying in the Wynn/Encore).
Things you need:
-Coconut water for hydration after all the libations
-Cheap, nice quality spirits (thinking of you, Maker's Mark)
-Mixers
-Sunscreen
-Aloe gel
-somewhat health(ier) snacks
-Fruits to keep somewhat healthy during your stay
-Gluten free goodies for when the tour you go on doesn't have anything gluten free.
-Bottled water to stay hydrated
and more!
I love Whole Foods!