Among the usual caviar massage and facials, this new day spa offers Le Sieste ($196): In a darkened room, guests recline in a large tub of hot water with floating rose petals. A muted voice and sounds drift through the water while an overhead light strip merges reds, purples, greens, and blues. Guests are asked to choose one of four immersions: Brazil, Turkey, Spain, or Central Asia. In the last, guests hear galloping horses, a drum beat, and a wailing shaman. It's kooky but refreshing (massages, $126).