A poster child for a 21st-century eco-sensitive resort that’s both stylish and “green,” this vehicle-free property south of Cancun offers guest rooms seemingly airlifted into treehouse-like units, a few of them set beside jungle-fringed waterways plied by electric boats. The accommodations are brightened by a sun-bleached color palette inspired by the lush tropical environment. The resort’s Willow Stream Spa incorporates indigenous ingredients and ancient native traditions in its treatments, though for many, a shady chaise lounge under a thatched umbrella on the sandy beach is all that’s required for relaxation. El Camaleon, site of an annual PGA Tour event and one of Greg Norman’s "least-disturbance" designs, tiptoes through the jungle, the holes tracing the curve of the resort’s canals. The course name was chosen because the layout transitions, chameleon-like, from dense jungle and mangrove swamp to seaside dunes that shelter a lovely pair of par threes.