Kicking off in Dublin, the Three Men are soon heading down the Grand Canal on Ireland's last original Guinness barge. They are only slightly hampered by the fact that it's over 80 years old, very heavy and somewhat difficult to start and even more difficult to stop. It has no brakes or reverse gear. The barge's lack of speed, temperamental engine and an endless succession of canal locks prove too much for Three Men and they quickly abandon it to take to the Royal Canal in a car with a difference...

The trio start by sailing down the Shannon in the best weather Ireland has had in years, stopping off along the way to visit a friend of Dara's who also lives in Ireland's most haunted castle. After that they must face sailing through the terrifying Ardnacrusha, Europe's largest lock. Arriving in Limerick, Dara and Griff try a spot of powerboat racing, while Rory decides to host his own poetry festival for limericks only - the inaugural Limerick Limerick Competition. The journey ends with a trip to the stunning Aran Islands, where the Men take a Galway hooker to visit the megalithic fort of Dun Aengus.