The Rainforest Spa at the Jalousie Plantation, St. Lucia
Seven tree-house cabanas host massages, wraps, and other indulgences at this new spa, but the most intriguing treatment takes place off-site at the island's active volcano. During the three-hour Sulphur Seduction, guests walk to nearby lava-heated sulphur springs for a leisurely soak before being coated with detoxifying mud. A shower under a waterfall follows, and a 20-minute massage back at the resort completes the adventure.
Photographs: Drew Altizer