We drove from Dublin after our flight from the US so we were famished by the time we got to Cashel. On the way to the Rock was the Rock House Restaurant. At lunch they offered an excellent buffet along with great service. Be sure to save room for the sweets downstairs.
Just up the HILL is the Rock of Cashel.
While some of the structures date from 1101, the majority of buildings date from the 12th and 13th centuries. Still pretty old to Americans.
We didn't read the signs at the entrance closely and entered less than an hour before closing. That really wasn't a problem as the employees didn't run us out and when we finished our wandering, the gates were closed. They let us out and we walked back down the HILL.
There is a paid parking lot just above the Rock House Restaurant with a passage to the restaurant.