The Saints' Way or Forth an Syns in Cornish, is an enchanting coast to coast route across Cornwall from the old fishing town of Padstow on the north coast to the historic port of Fowey on the south coast.   The trail follows the route used by traders, drovers, missionaries and pilgrims from Wales and Ireland during the Dark and Middle Ages to avoid the treacherous waters around Land's End.   Today, the Saints' Way is a fascinating walk through Cornish history as it passes barrows, menhirs and hill forts from the Bronze and Iron Ages; ancient granite clapper bridges and stiles; Celtic crosses, holy wells, chapels and monastic settlements; fine medieval churches; and derelict chimneys and engine houses from the tin industry of the 18^th and 19^th centuries.   The Saints' Way also passes through a wonderfully varied mix of scenery including tranquil estuaries and creeks, secluded river valleys, ancient woodland, windswept moors, rolling pastures dotted with timeless farmsteads and several charming villages and towns.