If the Las Vegas strip is synonymous with bustling crowds and headache-inducing lights, think of the Mandarin Oriental as a luxurious oasis in the midst of the chaos. The 47-story building is gambling- and smoke-free, trading the dinging noise of slot machines and cigarette puffs for delicately perfumed hallways, high-end facilities, and a serene, party-free pool. It's a bit of a splurge, sure, but retiring to a pristine, pin-drop-quiet hotel with plush beds and blackout curtains so dark you'll forget you're in Vegas is worth it, and easily more enjoyable than a late-night Calvin Harris set.