Luggage and bags:
one carry-on , and one empty duffelbag - you'll need it for new sweaters, woolens, linens, etc!.
Clothing/Shoes/Weather Gear: good walking shoes
3 sets of clothing - you can do laundry anywhere! wear layers to dress up or down
No need for formal wear (unless your staying in a 5 star castle) - this is a laidback country!
Toiletries and Medical Supplies: Bring prescription drugs if needed, but everything else you need is readily available!
Photo Equipment: I love my digital camera - no more hassle with hand inspection of film (or worse yet, finding your film is foggy from the scanning radiation!) NEVER pack film in checked luggage!!!!
Camping/Beach/Outdoor Gear: beaches look lovely but water is cold!!!! you can do without swimgear!
Miscellaneous: if American, you might want to bring a washcloth - lots of B&Bs don't provide them (they DO have towels - you just need a faceclothe)
The Sandrock Hostel at Malin Head is by far the best hostel I have stayed in so far. It is located...more
Lough Eske, Donegal, Ireland
Good for: Solo
Derry Road, Ludden, Buncrana, Ireland
Good for: Business