Go here for refinement, probably not experimentation [but maybe]. Great cocktails, impeccable service.
Our waiter noticed my girlfriend knew her beverage stuff, and offered to send their bartender out to tell us more. After chatting for five minutes, the bartender then offered to make us a 'Ramos Gin Fizz' - a vintage [and off menu] drink that takes 15 minutes to shake - because it was a slow night. Need I say more?
If you insist. It was delicious, and having been told the interesting history of the drink, it was all the more an experience. I wouldn't count on this happening to you, but the general sentiment of attention to detail and sincerity of service are not variables in this equation. And of that equation, expect a large number after the dollar sign.