A long weekend in Iceland's volcanic terrain, balancing dramatic natural spectacle with the spa. Days out reach the Golden Circle's waterfalls and erupting geysers, and go down inside the chamber of a dormant volcano. Back at the hotel, moss-covered lava fields ring a milky private lagoon, with silica mud masks and mineral soaks in between. Lunch comes among the vines of a tomato farm, and the last dinner is at a restaurant that has since earned a Michelin star.