Since we dont yet have a route for Sunday, can i suggest a wee sorte north of the river. Over the Erskine Bridge >> on to Balloch, turn left at roundabout beyond Duck Bay, head north through Glen Fruin down to Faslane, turn left, head south to Helensburgh, up Sinclair St, over the HILL back to Loch Lomond and A82 back to Erskine Bridge...... Roughly 45 miles Erskine bridge to Erskine bridge, plus Johnstone to Erskine and back......Nice wee Cafe stop in Helensburgh is an option