I rolled my eyes when our ground operator, Journey Mexico, included an excursion to a winery near San Miguel de Allende in our itinerary. Unlike Baja’s Valle de Guadalupe or the Valle de Parras in Coahuila, the state of Guanajuato doesn’t have much of a fine winemaking tradition. I suspected the wineries near San Miguel existed to help slake tourists’ bottomless thirst for alcohol, not because the region was conducive to high-quality wine.