Hi Skarpi.
Cars- from Dan Dooley hire was about £70.00 (all in with insurance etc) unlimited milage-we went down to Dublin to see Planxty.The year before we used AVIS cost a litle bit more about £75.00 Friday evening pickup 21.00 to Sunday 18.00 drop off at the airport. The road is quite simple from the airport to Belfast. A little bit complicated in Belfast it's self and then just bendy and dark but great fun from Newtownards down to Portaferry.
If there is no hostel then you'll not experience the great Ulster Fryup-
Thorri-not hard to guess where it evolved from is it like an upellyiah-spelling poor! (Feast and fires!)?