Ms. Hynes 's first Synge production , '' The Playboy of the Western World , '' his best-known play , dates back those 31 years , to 1975 , when she and the actors Marie Mullen and Mick Lally had the daft idea just out of university of starting a professional theater company , the country 's first outside Dublin , in the harbor town of Galway at Ireland 's western edge .