If you're coming in for an afternoon snack this bar is quiet and has a great cocktail list (their Old Fashioned's have a kick). The fries with garliclemon aioli and the grilled cheese are delicious.
All the bars in the Wynn basically serve the same cocktails. Go to Parasol Down is all you want is a drink. They have small bites and caviar here though, if you're looking for food.