Jon, Given your itinerary I would consider ditching Portmarnock - its good but not top 10 IMO. The drive would be better if you headed up the west coast played either Carne, Ballyliffin, Rosses Point, Donegal Etc and then went to Portrush, then to Co Down. Your drive is very intense- Ireland is the same size as Illinois- you will be driving out of your way given your itinerary. Have fun - the golf will be world class- the driving will be really tough IMO.