Mount Errigal is one of the highest mountains in the region, it's 752 m high. That doesn't sound too high, but trust me, when you are climbing it, it sure feels high!
There is a parking place about 1km from Dunlewy. From there you can walk up to Errigal Mountain. It takes about 1,5 hours to walk up to the top, at some points it gets really, really steep. From the top you will have spectaculair views! You can see the Atlantic Ocean and it's islands, Glenveagh National Park, all the mountains around. It's great!
Make sure you wear good shoes!! At the beginning you'll have to walk through some very boggy ground and once you have had that part, it becomes very rocky. Also be careful with the weather: if the top is in the clouds and/or it is windy, you should reconsider getting up there. It's very steep and you might walk the wrong way and you sure don't want to fall down there. (and what's the point in getting to the top if you won't see the fantastic view because of the clouds...)
Whilst not exactly short on impressive views, the one from horn head has to be one of the finest. Tory Island (see seperate tips) seems to look like a a postage stamp just off the shore.
The wild scenery is now a nature reserve, although there are a number of neolithic remains and geographical features to explore. I missed most of these due to the fact that there seemed to be force 9 gale blowing at the time.
I did, however, manage to get to the highest point (a grueling 50 meter trek from the road) where stand a couple of lookout towers. One goes back to the Napoleonic wars and the other (both now ruins) to world war I. Most sources claim it is from WW2, but this is clearly wrong - Donegal was part of the Republic by that time.
So, fantastic views, good walking and plent of seabirds - Donegal in a nutshell.
This is a beautiful place! There is a parkingplace just below the hill. On top of the hill there is an old watchtower. You can walk up here. BUT don't stick around there!! The view is great, but you would miss all the fun! You should walk down on the other side of the hill again and you can walk along the 200 m high cliffs there! When the sun is shining, the place looks even better. You will have spectaculair views on the cliffs!
The drive up to Horn Head in north West Donegal takes you out to a really scenic point overlooking the Atlantic Ocean. There is car park at the bottom of the hill and a short walk up to Horn Head itself. On tope there is an old lookout / watch tower that was used by the lifeguard and military in the past. On a clear summer's day this is just one of the most amazing places to be.