Well apparently its best to avoid some guy called Gary at Dunnes Stores in Grafton Street, Dublin!



Seriously though, Will you be hiring a car to get around? Do the Ring of Kells, The Sally Gap.
Oooh dont forget Glendalough, Powers Court, The Cliffs of Mohar...Skibbereen is a lovely little town, Cork is very interesting. Theres a lovely little seasidey town called Bray near Dublin...
In fact, I am biased.
ANYWHERE AND EVERYWHERE in Ireland is bloody gorgeous, and the people!!
Stick a pin in your map, you won't be disappointed.

Ah in that case best to google donegal and derry, lots to do and see but if you are relying on buses? you need to work out what you can fit into your own time-scale.
I do not know Northern Ireland at all.
Maybe someone else here can suggest some places.

Not really seen the interesting places in Northern Ireland and i bloomin live here!! All i can think of is the mourne mountains or the giants causeway!!

This should help you out tho!!

http://www.discovernorthernireland.com/todo/attractions.aspx