Imagine a pristine day on the water. The sky is an unclouded, aquamarine dome, the air temperature is in the high 80s without a trace of humidity, and the sea is as tepid as a baby's bath. Your charter yacht glides into a protected island cove, where the water is so clear you can see the anchor on the bottom. Taking the tender ashore, you find yourself on a white crescent of sand unmarked by a single footprint. Aside from the warm wind whispering through rocks surrounding the cove, the silence is complete.