Light floods the private terraces and high-ceilinged great room of this tropical treehouse. Polished concrete, wood paneling, and glass walls under a lofty peaked roof are industrial chic against the forested foothills on the Andaman Sea. Lounge in the shade of the sala with a chef's platter and dust off your pool skills in the games room. A 10-minute walk up the rocky coast gets you to soft sand.