I would definitely do Killarney at least Muckross Abbey and Muckross House. Also the Ring of Kerry. The Rock of Cashel is great and so is of course, Blarney Castle, which for some reason people keep saying I don't need to visit. There is a web site Ireland Information which is really great. This is my favorite place in the whole world and I go at least once a year. Erin Go Bragh!!!