FreeFallin,
There's loads to see in Ireland for such a small country. Driving around the coast is a good idea as you can get to all the major cities (Dublin, Cork, Limerick and Galway) as well as seeing some of the best scenery in the world. There's loads to see and do, depending on what you like. See http://www.ireland.travel.ie/home/ for useful info., accommodation, route planning etc.
Some general advice:
1. The weather is unpredictable. No matter how sunny it seems, even if there are no clouds in the sky, there's always about a 50% chance of rain. This increases the further west you go.
2. Irish roads are not all built to the quality you may be used to, so allow some extra travel time.
3. Limerick is not that bad, (compared to New York, say) but it is a city, so use common sense.
Just ask me if there's anything else specific you want to know. I'll PM you my phone no. so you'll have someone to call if you have any questions or run into any problems while you're here.