Glenveagh National Park
Glenveagh National Park near Letterkenny is a lush green expanse of oak forests, lakes, waterfalls, and rugged mountains. The park spans nearly 4,000 acres, with a number of walking trails to explore. Situated within the park is the picturesque 19th-century Glenveagh Castle. Take a guided tour to peruse its interior, which is decked out in its original furnishings.
Slieve League Cliffs
Rising nearly 2,000 feet from the sea about an hour’s drive west from Donegal, the cliffs at Slieve League are some of the highest in Ireland. Trails meander along the clifftops, including a hiking path that leads to the top of Slieve League, which provides sweeping views of the Atlantic Ocean, Donegal Bay, and the Sligo Mountains.
Arranmore Island
Make the 20-minute ferry hop across from Burtonport, midway down the west coast, and wander across its tranquil beach. The jagged cliffs are home to fulmars, while the waters below teem with gurnard and mackerel. Electric bikes are available to hire, and you can cycle past resident sheep up to whitewashed Arranmore Lighthouse.