There is so much to do within Kilkenny City:

Kilkenny Castle Tour

Kilkenny Road Train Tour

Medieval Mile Museum

Round Tower at St Canice’s Cathedral

Rothe House and Gardens

Butler Gallery

Butler House and Gardens

Smithwick’s Experience

If you're looking to go further afield:

National Reptile Zoo

Jerpoint Glass Studio

Jerpoint Abbey

Dunmore Cave

Kells Priory

Jenkinstown Woods

Visit https://visitkilkenny.ie/do/ for more!