Use the excellent AA (Automobile Association) routeplanner. It will gives the fastest route, with all road names, from your exact starting point and also offers options such as avoiding motorways: https://www.theaa.com/route-planner/route Kilkenny to Cork is a pretty short journey which, barring major traffic delays, is unlikely to take you much more than 2 hours even if you don't use the motorway (M8). If you take the N75 non-motorway option Waterford is the obvious stop. There's lots to do and see in what is sometimes called 'Ireland's oldest city' (it was founded by the Vikings in 853). If you take the motorway option, Cashel, with the famous Rock of Cashel, is an obvious stopping point. As it is such a short journey you could easily combine the two, taking the motorway to Cashel and then cutting across country to the N75 and Waterford. The AA routeplanner will give you route and road names for the Cashel > Waterford journey, which takes just under 1.5 hours. Assuming no time pressure, I'd choose Kilkenny > Cashel > Waterford > Cork as my route.