Diamond Head Grill, Honolulu
On Friday and Saturday nights, the W hotel's Diamond Head Grill transforms into the Wonder Lounge, a multibar club with DJs and dancing.
Plus: Ultimate Cocktail Guide
Fill two-thirds of a cocktail shaker with ice. Add the Chardonnay and cassis and shake well. Strain into a chilled martini glass, top with the Champagne and garnish with the lemon twist.