Been there. The sweet lady at the reception center advised us that the Stone would recognize the next King and would call their name. She told us to be sure to come back and let them know if it was one of us!!
This place is serene yet has a marvelous sense of history about it. While there’s really not much to see, like large buildings or beautiful windows, we stayed half a day just soaking it all in.
I spent a week in Killarny once and for most of it my wife and I wondered around the ring of fire. There was the Muckross house and Killarny is beautiful but it compares to just the land around it. Ireland is a grand country.