[RWD version 1 ] Having ascended Corkog numerous times, I would say this route is by far my preferred one. It's easy to get stuck in difficult terrain on the way up, with rocky crags, gullys and boggy sections. This route navigates south and then west in order to avoid most of the ackward bits, and makes use of a large slabs of rock to escape bog.
This was my friends first time on Corkog so after getting to the summit we circled around the summit, first to the west and then north of the summit to make the most of the clear day and fantastic views into the numerous mountains ranges to our north and north west. This also took us out of the harsh atlantic wind which was welcome.
If you're in Galway with limited time and want a quick hike to one of the "proper" mountains, Corcog is my go-to mountain, and this route provides for a relatively hassle free ascent.
Note: The first 300 or 400m of the walk are boggy, no way around it. If you don't have waterproof boots then pack a pair of wellies in your pack!