Investment banker-turned-farmer and philanthropist Barry Hoffner’s fate as a world traveler was decided by a coin toss a half-century ago. “After high school, I wanted to go to Hawaii to surf, and my best friend wanted to go backpacking in Europe,” the Sausalito, California resident told The Post. “He won, and that trip changed my life.” From that moment on, Hoffner lived and worked in Russia, France, Japan, and Singapore, took a two-year travel sabbatical through Asia, and hitchhiked through Africa with his late wife, Jackie, eventually establishing their educational foundation,  Caravan to Class,  in Timbuktu, Mali, in 2010. By the time he was in his mid-50s, Hoffner had seen the sunrise in 100 countries.…