If you are travelling as far as Douglas village you can take city route 7 from Patrick's Street, Grand Parade or South Mall.  City route 16 from South Mall will also take you to the village.  If you are travelling to Douglas east village then city route 6 from South Mall.  Both 6 and 7 are very regular routes on Sundays.  The number 7 operates to Donnybrook via Douglas, the number 6 operates to Frankfield via Douglas and the number 16 operates to Rochestown via Douglas.