I’d concur with Iron Man’s recommendation on this handy tourist field guide. Used this little booklet extensively whilst visiting sites in Cork last year. The book (ISBN 1 901983519) includes a map with some stylised pen and ink drawings. Similar publications I found of use when planning visits to sites were “Antiquities of West Cork” by the same author (ISBN 1 001083101) and an illustrated map/guide “Antiqities of the Beara Peninsula”. All three can be purchased from good sized local Tourist Information Ofiices.
For the completist, I also found the following in a bookshop in Bantry very useful:
An Archaeological Survey of the Mealagh Valley (1998) David Myler (ISBN 0 95349280X).