The Liffey river rises in County Wicklow and flows through Wicklow, Kildare and Dublin before entering the sea at Dublin Bay.You could spend a whole day walking along the Quays by the Liffey from the newly developed docklands area up to Phoenix Park, and occasionally detouring up little side streets. The Temple Bar district is very close. Cross the famous Halfpenny bridge (free nowadays!). Detour to the National Museum of Decorative Arts housed in the huge old former Collins Barracks up at the Phoenix Park end of your river walk. Visit the Church of St. Michans to see the crypts on the way and admire the architecture of old and new on your journey.You can also take a river cruise from March to November.