Leafy luxe: Stay in treetop suites on the grounds of this Hampshire, England, resort located on the edge of New Forest National Park, just a 20-minute walk from the beach. Refresher course: In October, the resort offers a "treetox" program. By day, you'll take brisk walks with Nordic poles, then enjoy Himalayan-bath-salt soaks. At night, you'll journal and attend emotional "de-blocking" sessions. The five-day program, including meals, is about $4,200 (chewtonglen.com).