I've seen much of it (sadly not Oweynagat yet), but do want to visit again to see more. It's an odd place 'on the ground' because of the level-ness of the terrain (I know it does slope east-west slightly and there are two ridges at Carnfree and Caran, but it's still quite flat)

Even standing on the top of Rath Cruaghan it's difficult to appreciate what is around you. Must go back.