My partner and I spent a few hours at the gardens before our flight home from Dublin (35 mins away by car on the M50). There is a stunning view of Sugar Loaf mountain from the top of the gardens behind the house. The layout of the gardens is so easy to explore, and we managed to see everything in our short visit (but could have spent all day there, and plan to when we return). Can't recommend this highly enough if you are looking for a peaceful, beautiful place to explore outside of the city. There is a garden centre, café, an AVOCA, an interior decor shop and dolls' palace too, adjacent to the gardens.
So lovely. Powerscourt Hotel, Spa, golf course and waterfall next!