Moving through the yoga flow sequence at sunrise, I became so locked into the rhythm of my breath that my surroundings faded away. It wasn't until I paused in a cobra pose, glancing upward, that the magic of the moment broke through: Butterflies fluttered above me, and a rainbow arched through the clouds. I had drifted into such a deep state of relaxation that it was easy to forget I wasn't alone in some remote destination, but on a cruise ship with nearly 800 other passengers.