5-Day Ireland Itinerary

Planning a 5-day Ireland trip and would love some feedback on the overall flow!
Day 1: Arrive in Dublin, explore the city center, coffee, shopping, casual dinner.
Day 2: Historic Dublin (Book of Kells, Trinity College, Dublin Castle, St. Patrick’s Cathedral, Guinness Storehouse).
Day 3: Cliffs of Moher day tour.
Day 4: Either Howth (cliff walk + harbor) or another day exploring Dublin with shopping, followed by a nice dinner.
Day 5: Fly home.
Does this seem like a good balance? Would you swap anything around, skip something, or add anything? Is Howth worth dedicating a day to with a short trip?