I sat down recently and counted — surprising myself — that I've notched visits to 24 of Mexico's 32 states, for leisure or while reporting. Querétaro is a highland charmer. Nuevo León is the country's muscular northern colossus. Campeche, a verdant beauty. Everywhere I go in this country, I find new wonders. Then I visited Colima, and it hit me that Mexico is an endless cornucopia that will ...