Ireland Guided Tours

I'm planning an 11 day trip to Ireland for mid-July and to avoid renting a car, have been considering taking day tours from Dublin and/or Galway. I'd very much like to see the Ring of Kerry, the Giant's Causeway, Bru Na Boinne and not fret over staying to the left whilst driving. There seem to be a number of tours but little in the way of trustworthy reviews. I'd love some recommendations on which ones to book and which ones to avoid. Many thanks!