Every Sunday, from 4pm onwards, the Eclipse Bar at the W Hotel serves a 'drunch' (high tea) made up of Asian dishes. You can try their dim sum – steamed rolls typical of Chinese cuisine – and excellent tea. Then round it all off with a good cocktail.
As for the nighttime scene, Eclipse requires cocktail attire, and they're not joking. Try riding up the lift to the twenty-sixth floor in your street clothes next to a couple of leggy model types draped in sparkles and attitude. You could always find a quiet corner early on to enjoy a cocktail and take in the stellar view.