Hello! Been trying to decide between renting a car and hopping from train to bus to taxi and back for the first couple of days a friend and I are staying in Ireland. We're flying into Dublin and then thinking of going to Newgrange first, then going north to Belfast and spending the afternoon/evening, as we have an early tour of Northern Ireland the next day, all day. At first I thought it'd just be easiest to rent a car--thankfully I drive manual and we won't have much luggage--but didn't want to waste the trouble and have the car sit in Belfast all day on the second day, only to return to Dublin that night. Trouble is, can't seem to find an efficient way to go from the Dublin airport to Drogheda, then Newgrange, then up to Belfast (although Belfast --> Dublin by train seems easy enough for the next day). Sorry this is wordy, I'm a writer and tend to over-explain. Any tips would be most helpful, thanks!
Day 1: early morning flying into Dublin, spend midday at Newgrange, evening in Belfast
Day 2: all day tour of north that leaves from Belfast, back to Dublin by evening