Rancho Pacifico

The directions up the mountain begin with "just after the highway ends" and only get more specific from there, which tells you something about this adults-only rainforest resort on Costa Rica's southern coast. Two hundred and fifty private acres, never more than twenty guests, and the elevation is calibrated precisely to keep nights cool and mosquitoes absent. A Michelin Key property, with villas built into the canopy twenty feet above their own gardens.