Kristine - this is a loaded question.
Dublin is a lot like Boston. Lots of historical sites with the famous Temple Bar area.
If you've never done Dublin, you have to do it once. As far as I'm concerned, that's all you need to do. The real beauty and the people (the best part) are in the small towns and villages.
I would highly recommend that you check out the Irish House Party. For years it has been one of the top rated Trip Advisor attractions. I know we had a blast. It is dinner, music, dancing all in a family style setting. http://theirishhouseparty.com/
Have a great time!