Then it's Cork for you! Stay somewhere around Macroom and fill your boots!

Buy the OS maps (they are far better marked than the British ones) for Cork area and when your jaw has stopped dropping at the shear volume of sites have a nose around the net for recommendations.

I am down in Cork for the weekend in two weeks time and I thoroughly expect to see over 50 sites !!!

There are two nice portal tombs in Cork and many a wedge tomb. Make sure you get to Labbacallee!

As for circles try and get hold of this book

http://www.megalithomania.com/show_review.php?book_id=29

and/or this one

http://www.megalithomania.com/show_review.php?book_id=27

seem to be just the ticket