Can anyone recommend a tour guide/company for a one day visit to this famed Neolithic site.
Mary Gibbons. Email now to book. She fills up fast. https://www.newgrangetours.com/
If Mary has no space, it is relatively easy (and totally worth it) to travel by train from Dublin to Dragada and taxi to the visitor center. We scheduled a late afternoon tour at Newgrange which allowed us to spend all morning in Dublin and take a noonish train. The express train takes a little over a half hour
Agree this is very easy to do yourself if you prefer. Just a small correction, the town you get the train to is called Drogheda.