Well, you've got the four stone circles in a day:

Broadleas (actually in Kildare, but just over the border)
http://www.themodernantiquarian.com/site/943/broadleas.html

then a a 10 minute drive to Athgreany
http://www.themodernantiquarian.com/site/1255/athgreany.html

another 10 minute drive to Castleruddery
http://www.themodernantiquarian.com/site/1257/castleruddery.html

then on to Boleycarrigeen (you'll need a map)
http://www.themodernantiquarian.com/site/1256/boleycarrigeen.html

If you're feeling like the exercise, Seefin is unrivaled (not for the exercise, but its construction and placement)
http://www.themodernantiquarian.com/site/1253/seefin_hill.html

These are west Wicklow (the county is practically split in two by the mountain range of the same name). However, depending on where you are staying, the dolmens of south county Dublin are well worth while, e.g. Glendruid
http://www.themodernantiquarian.com/site/908/glendruid.html

If you fancy a couple of bullaun stones, http://www.themodernantiquarian.com/site/1558/kilbeg.html Wicklow is the place.

If you can get to Carlow too, how about Browne's Hill and Haroldstown dolmens, and Ring of the Rath, or Rathgall hillfort?