Best day trips from Dublin
Ireland is small. Most of the country is a day trip from Dublin if you don't mind getting up early.
5 best day trips from Dublin
Cliffs of Moher
How: Long day — tour bus best (10-12h round trip)
Travel time: 3h each way
When to go: Apr-Oct; winter winds can be unsafe
Ireland's most iconic landscape — 200m sea cliffs over the Atlantic
Howth (coastal village)
How: 30 min DART train
Travel time: 30 min
When to go: Year-round; sunny days best
Cliff walk, seafood, harbor village 30 min from city center
Glendalough
How: 1h via St Kevin's Bus or tour
Travel time: 1h
When to go: Year-round
Monastic ruins in the Wicklow Mountains — atmospheric and uncrowded
Kilkenny
How: 90 min train
Travel time: 1h 30m
When to go: Year-round
Medieval castle + cathedral + craft-brewery walking tour
Belfast (Titanic Museum + Giant's Causeway)
How: 2h Enterprise train + tour
Travel time: 2h+
When to go: Apr-Oct
Different country (NI), border-free crossing, Titanic Museum + Causeway in one day