Start at Trinity College Dublin & the Book of Kells on College Green, ideally for a timed entry around 9:00–9:30 AM. Allow about 1½ hours for the Book of Kells exhibition and the Long Room; booking ahead is sensible, as September mornings fill quickly. Tickets are typically around €### and entry is indoors, making this a good first stop whatever the weather. Afterwards, walk south along Nassau Street and across Merrion Square—about 12 minutes—to the National Gallery of Ireland.
Spend roughly 1½ hours at the National Gallery of Ireland, where the collection includes major Irish and European works and is particularly easy to enjoy at your own pace. General admission is free, though special exhibitions may charge separately; check the opening hours and exhibition schedule before setting out. For lunch, stroll via Dawson Street and Suffolk Street to Avoca Suffolk Street in Temple Bar, allowing around 15 minutes. It is a convenient, relaxed stop for soups, salads, sandwiches, and cakes, with lunch usually costing about €15–25 per person.
After lunch, walk west along Dame Street to Dublin Castle, roughly 8–10 minutes from Avoca Suffolk Street. Set aside about 1½ hours for the State Apartments, medieval undercroft, and the castle grounds; guided and self-guided admission options vary, so reserve ahead if you want a tour. The castle generally opens from around 9:45 AM, with last admission in the late afternoon—check the official schedule for your date. Once finished, take an easy wandering route through Cork Street and Aungier Street towards The Long Hall on George’s Street, about 12 minutes away. Arrive in the early evening for a pint in this beautifully preserved Victorian pub: it is compact and atmospheric, so going before the busiest hours gives you a better chance of finding a seat.
Start at Kilmainham Gaol Museum, arriving for a timed guided tour around 9:30–10:00 AM. Allow roughly two hours, including the atmospheric Victorian prison wings and the chapel where several 1916 leaders were held. Tickets often sell out well ahead, so book directly in advance; admission is usually about €8–€10. From central Dublin, the easiest approach is the 13 or 123 bus, or a taxi taking around 15–20 minutes. Afterwards, walk a few minutes to the Irish Museum of Modern Art at the Royal Hospital Kilmainham. The galleries are generally open Tuesday–Sunday from late morning until 5:30 PM, with free general admission, though special exhibitions may charge. Give yourself about 1½ hours to enjoy the art and the elegant seventeenth-century courtyards rather than rushing through.
Walk or take a short taxi to the Guinness Storehouse in The Liberties—about 15 minutes on foot from IMMA. Book an afternoon slot, ideally around 2:00 PM, and allow two hours for the brewery story, tasting experiences, and the Gravity Bar, where the city panorama is best enjoyed slowly rather than just photographed. Standard tickets commonly cost around €22–€ treinta, depending on the package and date. From there, it is a pleasant 15-minute walk through The Liberties to Teeling Whiskey Distillery in Newmarket; arrive for a pre-booked late-afternoon tour and tasting, usually lasting about 1½ hours and costing approximately €20–€30. Finish at The Fumbally, only a short walk away, for a relaxed dinner of seasonal, produce-led cooking. It is popular and does not always take bookings for every table, so go early or reserve ahead; allow €25–€40 per person.
Take the DART from Tara Street, Pearse, or Connolly around 9:00 AM; trains to Dún Laoghaire take roughly 25–35 minutes. From the station, it’s an easy walk down to Dún Laoghaire Harbour and the East Pier. Allow about 1½ hours to stroll out along the broad granite pier, with excellent views across Dublin Bay and occasional glimpses of boats leaving the harbour. It can feel much cooler and windier by the water than in the city, so bring a light waterproof layer. Parking around the harbour is limited, making the DART the sensible choice.
Walk inland to People’s Park Market, held on Sundays and usually running from late morning into the afternoon; check the market’s September schedule before travelling, as stall numbers and opening times can vary. It’s a good place for coffee, pastries, local produce, and small crafts rather than a formal meal. From there, continue to the National Maritime Museum of Ireland, housed in the former Mariners’ Church. Set aside about an hour for the ship models, navigation instruments, and stories of Irish seafaring; opening hours are commonly around late morning to mid-afternoon, with admission generally in the low single figures or by donation. Afterward, have lunch at Hartley’s Restaurant near the harbour. Expect approximately €25–45 per person, and book ahead if you want a guaranteed table on a Sunday.
After lunch, take the DART south from Dún Laoghaire to Killiney—around 10 minutes—then walk or use a short taxi ride to Killiney Hill Park. The park’s paths climb through woodland and open ground to the obelisk viewpoint, where the panorama stretches over Killiney Bay, Dalkey Island, and the Wicklow Mountains on a clear day. Give yourself about two hours, including the climb and time to enjoy the view; sturdy shoes are useful after rain. Return from Killiney by DART, or take a taxi back to Dún Laoghaire if you would prefer to finish beside the harbour.
Take the DART from Dún Laoghaire around 8:00–8:30 AM and get off at Tara Street or Pearse; the journey usually takes 25–35 minutes. From either station, walk towards St Stephen’s Green—allow roughly 15–20 minutes from Tara Street, or take the Luas Green Line one stop if the weather is poor. Begin with an unhurried circuit of the park, looking out for the Victorian lake, bandstand, and quieter north-western paths. The gates generally open from early morning, and this is a particularly pleasant time to visit before the city centre gets busy. Afterwards, walk a few minutes to the Little Museum of Dublin on St Stephen’s Green for its entertaining, guide-led story of twentieth-century Dublin; tours are scheduled, so check the morning times and reserve ahead if possible. Admission is usually around €13–15.
From the museum, it’s a five-minute walk down Drury Street to George’s Street Arcade, one of the city’s best places for browsing without a fixed agenda. Spend about an hour among vintage clothing, jewellery, small gifts, food counters, and independent traders; most businesses open from late morning, with shorter hours possible on Sundays. Continue west along Aungier Street and through the lanes around Dame Street to Queen of Tarts on Cow’s Lane, roughly a 10-minute walk. Set aside €15–25 per person for a homemade savoury lunch, coffee, and one of the excellent cakes—arrive slightly before the main lunch rush, as seating is limited and the café is popular.
After lunch, cross towards Christ Church Cathedral on Christchurch Place, about five minutes away. Allow 1½ hours for the nave, medieval details, and atmospheric crypt; opening times vary with services and events, and adult admission is generally in the €10–12 range. From here, wander east through the old streets towards the Molly Malone Statue on Suffolk Street, then follow Grafton Street south for an easy final hour of buskers, department stores, and lively people-watching. The statue is a quick stop rather than a destination in itself, so leave room to detour into Powerscourt Townhouse Centre or settle into a nearby pub if you fancy a drink before heading back. All of today’s stops are walkable; allow 10–15 minutes between the cathedral and Grafton Street, and keep a Leap Card or contactless payment handy for the return DART if you are going back to Dún Laoghaire.