Dublin is smaller than most first-time visitors expect. The historic centre fits into a rough rectangle you can walk across in 25 minutes, from Trinity College on the east to Kilmainham on the west, with the River Liffey cutting the whole thing in half. Three days is enough for the essentials plus one proper escape from the city — and if you plan it right, you'll never need a taxi.
Practical basics first
Buy a LEAP Visitor Card at Dublin Airport arrivals (about €10 for 24 hours, €19.50 for 72 hours). It works on Dublin Bus, Luas trams, and DART trains — including the Airlink 747 bus into the city (about 30 minutes to O'Connell Street). Don't rent a car unless you're leaving Dublin; parking is painful and streets are one-way mazes. Base yourself in Temple Bar, near Grafton Street, or the Docklands — everything else radiates from there.
Day 1 — Georgian Dublin and the black stuff
Start at Trinity College (entry to the grounds is free, walk through the cobbled squares). The Book of Kells exhibition and Long Room library are the reason most people come — book online (€18.50, timed slots) because same-day walk-ins now regularly sell out. Give it 90 minutes. Then head south to Grafton Street for coffee at Bewley's (upstairs, the stained-glass Harry Clarke windows are the real draw), before wandering into St Stephen's Green for a bench and a rest.
After lunch, take the Luas red line or walk 25 minutes west to Kilmainham Gaol. This is the most emotionally heavy site in Dublin — the leaders of the 1916 Easter Rising were executed here. Guided tours only (€8, must book online). Straight after, cross the road to the Guinness Storehouse (€28.50, book time slot). Yes, it's touristy. Yes, the top-floor Gravity Bar with 360-degree views is worth it. Your ticket includes a pint — they'll show you how to pour it. Dinner and a session in Kehoe's or the Long Hall on South Great George's Street.
Day 2 — Medieval Dublin and modern history
Dublin Castle (€12, self-guided) sits where the original Viking fortress stood — the State Apartments are gilded, the Chapel Royal is gothic-revival theatre. Then a five-minute walk to Christ Church Cathedral (€8), followed by St Patrick's Cathedral (€9) — both worth seeing, though if you're short on time, pick one. Christ Church has the more atmospheric crypt.
In the afternoon, go to EPIC — The Irish Emigration Museum in the Docklands (€21, allow 90 minutes). It tells the story of 10 million people who left Ireland — the famine, the diaspora, JFK, Grace Kelly, Ned Kelly, all of it. It's genuinely excellent, one of the best-designed museums in Europe. Walk back along the Liffey, cross the Ha'penny Bridge (originally a toll bridge, half-penny to cross), and into Temple Bar for dinner. The pubs here are packed and overpriced but the atmosphere is real — order a pint at The Temple Bar Pub for the photo, then move on to The Palace Bar or Mulligan's for a serious drink.
Day 3 — Green space or the sea
Two options. Phoenix Park is the largest enclosed urban park in Europe (707 hectares, twice the size of Central Park). You can rent bikes at the Parkgate Street entrance and cycle to Áras an Uachtaráin (the President's residence, viewable from outside), Dublin Zoo (€24), and see the wild fallow deer herd. Perfect on a sunny day.
Better option, if the weather holds — take the DART north to Howth (30 minutes from Connolly Station, €4 return with LEAP). It's a working fishing village with a proper cliff walk. The Purple Loop takes about 2.5 hours around the head, with views of Lambay Island and the Wicklow Mountains. Eat fresh fish and chips at Beshoff's on the pier, or splash out at Aqua for oysters. You'll be back in the city by 6pm.
One honest tip
Skip the Leprechaun Museum, skip the hop-on-hop-off buses, and don't drink in a pub that has a bouncer or a screen showing sport — you'll pay 40% more for beer poured in a hurry. Dublin's real pubs are quiet, small, and often unmarked. Ask a local; they'll always tell you.