Always tip the staff well (especially valet) and you'll be fine.
Depending on the night of the week and time of year I can think of a few off the top of my head: Ritz, ZaZa, Omni, W, Palomar, Lumen. The key is following their routine networking nights (First Fridays, Last Tuesdays...you get the idea) and/or the events in the area.
I say again: Always. Take. Care. Of. The. Staff. They are there to help you and they will.

(don't look like a hooker, don't act like a hooker, never approach anyone, act like you belong there)