bring the TME with you, its pretty useful.
If you come in by Dublin then do spend maybe 2 days there and visit Boyne Valley and Loughcrew.
We have a new snazzy motorway system so it may be worth heading to Cork via Lough Gur just outside Limerick (My personel fav) and then from Cork using the TME to visit some of the stone circles of Cork and Kerry.
Take in Galway city, its a lovely cultural city and then up to Sligo to Carrowkeel and Queen Maeves Cairn and Carrowmore.
Bugger I think what Ive recommended would take at least 10 days.
I posted this on the other irish thread below, you've probably read it but just in case.