If you haven't already done it, grab a copy of Rick Steves' book about traveling Ireland. It's not the end all and be all but it will be a valuable resource for you. I second (or would that be third) the suggestion to go up to Dingle and take the drive out around the pennisula. That may well have been the highpoint of my recent trip. The pupbs were great fun and the sense of history seeing the behive huts and the Oratory were overwhelming. Whatever you do, you're going to have an awesome time.

Jamie