When staying at ARIA, Michael Mina's French bistro BARDOT is a must. Especially for Happy Hour. I'm not sure if I'd go here during regular hours as prices are $$$$ but then again, Happy Hour...
HH prices for cocktails were around $10, and small plates between $10 and $19. Highlight were the Tartines - shrimp, avocado, and fried egg were all delicious ($8 each).
The bartender kept the drinks coming, and one is happily eating away. Good times.