A very nice modern lounge at the JW, amazing view since it's on the top floor, perfect to chill with friends. It's not over crowed. Good choice for drinks an not extremely busy.
Happy hours (esp on some yummy cocktails)until 8pm on a Saturday. That's an awesome deal for a 5 star so make the most of it. And then there is the view.
Vault is located high on 71st and 72nd floors, allowing panoramic vistas of Dubai. It's world class design and array of premium beverages cater for the elite.