Ireland in March

Who is "we"? What are your interests? Why have you chosen Kilkenny, Dingle and Galway? Do you plan to rent a car? One way to determine how much time you need a particular location is to make a list of the places and things you want to see and do, research how much time those normally take, and do the math.
I was in Ireland with a friend in March 2025, and we had pretty much all the weather. A couple of sunny days that started quite cold and warmed up enough that we took our jackets off while sitting in the sun. Mostly it was overcast and low 50s. I am from the Northwest, so this is our normal most of the year. It did rain quite steadily one day in Dublin, but we were mostly indoors.
Newgrange is easily done as a day trip from Dublin, but if you're returning a rental car at the airport, you might think about staying your last night in that area (Drogheda, Malahide, Trim).

G3rryCee-I am sorry that I didn't give enough info. I will be with my husband until the students leave, then my brother in law and sister will join us. We will be renting a car once we leave Dublin.
I like a mix of nature and history and prefer to stay in places that we can walk to restaurants, shops, and pubs. The places I chose seem to meet those needs. I am open to other places, but I do like the idea of walking instead of having to get back in the car and find parking.
I like the idea of listing what we want to see and "doing the math." As the trip planner, this forum has been a wonderful resource. I appreciate your advice.

One word of caution about Kilkenny: driving in the city center is not for the faint of heart. This is probably also true in Galway, though I'm less familiar with it.