A bumpy, 10-passenger plane ride from Belize City takes you over lush green jungles, craggy mountaintops and skims along the vibrant Caribbean Sea, dotted with paradisiacal atolls, before coming to land on a one-strip airport, a slash of dusty red in the midst of thick treetops. This is the airport of Punta Gorda, the southernmost town in Belize, population 5,000.