Hike around the area of Powerscourt Falls, the highest waterfall in Ireland (it's not very big). We wandered into the woods and made our own route, stumbling at one point into a Santa photo booth at the end of a dirt road in the middle of nowhere!
From there we wandered around Glasnevin Cemetery, which was creepy but cool, and then quenched our thirst at this neat little pub beside the cemetery called Gravediggers:
http://www.bbc.com/travel/story/20161019-where-gra...
I was only there for a few days but think I made the most of it!