Lough Tay, also known as Guinness Lake, is a stunning spot nestled in the Wicklow Mountains. Owned by the Guinness family trust, this private estate boasts inky black water that resembles a pint of Guinness from above. Visitors can enjoy breathtaking views of the lake from various viewing points along the Sally Gap Drive and explore nearby hikes like the Lough Tay to Lough Dan walk or the challenging Luggala hike. Just remember, you can't actually get down to the lake itself, but the views are well worth the visit!