Ardmore Co. Waterford Ardmore is a real gem, but a bit out of the way from everything else you'll want to see when landing in Cork. It is relatively undiscovered by tourism. The Cliff House in Ardmore is one of the best restaurants in the country - it's got a Michelin star. It's also fairly pricey - ~€100/head for a meal. There's also the bar separate to the restaurant which also serves good food, and both have the most incredible view. If the weather is favourable, a coffee on the patio the next morning would be nice too! White Horses is a more low-key restaurant in the village which is also well regarded. I know you'll be jet-lagged, but maybe before leaving the next day, consider doing the Cliff Walk around St. Declan's Well. It's particularly scenic, and even doing a small portion of the trail is worthwhile.
Lastly, the Round Tower in Ardmore is likely the only you'll see on your trip. Inside the old church are a few Ogham stones (or as Katharine calls them, bear scratches) - very