What would a trip to Las Vegas be without copious amounts of eating, drinking, and nightlife? Herewith, a bon vivant’s guide to the southern tip of the Strip.My first trip to Las Vegas since last June’s JCK show begins, appropriately enough, in a restaurant full of furniture upholstered in gemstone colors: amethyst, tanzanite, pink tourmaline. My mom, Natasha, and I are eating lunch at Raffles Café at Mandalay Bay on a sunny, brisk day in late February. We’ve just checked into a suite upstairs after a short, breezy flight from Los Angeles. As the ceiling fan stirs the languid air, I steal glimpses of the hotel’s famed beach through the café’s windows. Its white sands haven’t yet opened to spring break revelers. The deserted scene reminds me of an abandoned tropical shore. Photograph by Sarra Fleur Abou-El-Haj, Styling by Brooke MagnaghiFan earrings in 18k gold, $