In reply to Pyreneenemec:
> The Reeks have the highest summits and some great ridges and scrambles but personally I prefer the Beara or Dingle mountains for their proximity to the Atlantic and the fantastic views. The Faha ridge on Brandon is great fun, combining this with some of the Dingle Way. You could do the same on the Beara with perhaps a trip over to Dursey Island ( via Ireland's only cable-car). At this time of year, isolation and peace guaranteed !
All of those places are lovely, but they're also located in Co. Kerry, rather than Co.Cork.
Closer to Cork city, it may be worth taking a look at a spending couple of days on the Sheep's Head Way:
http://www.thesheepsheadway.ie/
It's possible to do a couple of days out along the peninsula, with an overnight wild camp up on the hilly ridge overlooking Bantry Bay. Out towards Akahista or Kilchrohane, and back again, ought to fit the bill.
Edit: The Beara Peninsula is common to both Cork and Kerry.
Post edited at 10:42