So, finding anything open for breakfast was a bit problematic. But we persevered and eventually prevailed with good ol' fashioned Amurican gumption. (We just stood around in restaurant foyers until someone was eventually willing to feed us.)
Luckily the National Gallery of Ireland was open, and within two minutes walk of the hotel, so we got to see like some art and stuff.
Later, we went for an evening walk through Merion Square.