Swim at Dawn, Then Watch the City Close Its Doors
You wake on 24 December to a city running on a half-day clock. Reykjavík's municipal pools open at 08:00 and shut at 13:00, so the earliest hours of Christmas Eve belong to the geothermal water — steam off the surface, a handful of locals doing lengths before the day turns domestic. Go early, then use the remaining morning to finish what you need: groceries, pharmacy stops, anything you'd rather not chase tomorrow. Shops and venues close progressively through the day, so treat the morning as your window and the afternoon as the reward.
Take the Decorated Walk Through the Old Centre
The lit streets of the old centre — Lækjargata, Austurstræti and Laugavegur — form one continuous, walkable route, and 23 December is the livelier evening for errands, food and lights before the city settles. If you're in town on the 24th, that same route makes a compact, unhurried walk: the Christmas Cat near Lækjargata, shop windows along Laugavegur, the low winter light on Austurstræti. It's a short loop, which matters when the weather turns and you want to be back near your base. Keep it to a stroll rather than a campaign — the point of Christmas Eve here is that the city is winding down around you, not staging anything.
Eat a Prebooked Christmas Eve Meal
Iceland's Christmas Eve meal is the anchor of the day, and for a visitor it has to be arranged in advance. Book the restaurant table separately from your hotel, and confirm in writing: the date, the sitting time, whether it's a set menu, your dietary needs, the child policy, prepayment and cancellation terms. Do this well before December. Many kitchens run a fixed Christmas menu on the 24th and fill up; a table you assumed you had is not a table you have. The same discipline applies if you're relying on hotel service — ask directly whether the restaurant is serving on the 24th, not whether it usually does.
For the flavours of the season, look to what Icelandic Christmas tables carry: the book-buying flood, Jólabókaflóð, runs through the Advent season to 22 December and pairs naturally with a café stop. Advent to 22 December is when the broadest programme of markets, concerts, workshops and family events is on, so if your trip allows, arrive before the 24th and treat Christmas Eve as the quiet close rather than the main event.
Mark the 18:00 Turning Point, Then Keep It Small
Christmas is "rung in" at 18:00 on 24 December, and after that the city becomes markedly quieter — the streets thin, the traffic drops, and what's left is lights and weather. Plan your evening accordingly: a short lights walk or a waterfront stretch before or just after six, then indoors. If you want music, the Advent concert programme is your best bet, but it sits earlier in the month; on the 24th itself, ground your expectations in what you've confirmed rather than what you hope is open.
For the rest of the holiday, the pattern is selective. On 25 December all Reykjavík municipal pools are closed, so rely only on restaurants, hotel services or tours you have confirmed for that exact date. On 26 December the pools run 11:00–17:00 and the Reykjavík Art Museum Hafnarhús is open 13:00–17:00 — confirmed options, not proof that everything reopens. From 27 to 30 December, services resume on differing schedules: pick one museum, pool, tour or meal to confirm, and keep the rest loose.
Know Where the Season Runs On, and Where It Ends
If your stay stretches past Christmas, 31 December brings neighbourhood bonfires and citywide midnight fireworks with no single official show — the municipal bonfire list is not published well ahead, and previous years' addresses and times don't carry over, so check when you're there. Personal fireworks and flares are not permitted at the bonfires. New Year's Day is a quiet morning with selective openings, and 6 January, Þrettándinn, closes the season with local events that vary by municipality — check the programme rather than assuming.
Two practical habits will carry you through the whole period: check holiday bus timetables before you depend on them, and keep your plans close to where you're staying. Winter weather and reduced service both reward a short radius. The Yule folklore is part of the texture here — thirteen Yule Lads and the Christmas Cat — and if you're travelling onward, regional versions appear at Dimmuborgir and the Akureyri Christmas House.
Start with the two things that must be locked in: your Christmas Eve table, confirmed in writing, and your decision about whether to be in Reykjavík for the Advent weeks or only for the quiet 24th. Build the rest — the dawn swim, the old-centre walk, the 18:00 turn — around those, and let the city's own slow-down set the pace.