I dont think there are that many "show sites" in tipp really. Im in the process of buying a house in Cahir so I should be getting a feel for the area over the coming year.
The hill-tops are covered in cairns and Im looking forward to climbing up to them.

What I could recommend and it might be nice is Longstone Rath, http://www.themodernantiquarian.com/site/7744,
Duntryleague isnt that far away either and is sign-posted http://www.themodernantiquarian.com/site/2577
Obviously wont be able to see these at night but they are fabulous and can be seen from Duntryleague
http://www.themodernantiquarian.com/site/8072.

I think they are the main sites North Cork and Kilkenny and don't know much about to be honest.