For too long Mexican travel, for overseas visitors, meant nothing but sun, sand, and surf. In the boutique-hotel era, however, there are opportunities for all kinds of destinations to shine. Among them is Tepoztlán, a mountain town near Mexico City that’s known for its significance in Aztec history and culture — as well as the ruins of the nearby El Tepozteco temple, and the national park that surrounds it. And with the advent of Amomoxtli, the region’s first high-end luxury boutique hotel, ...