Things to Do in Reykjavik in December

Silfra fissure, cracked open between the North American and Eurasian tectonic plates in Þingvellir National Park, holds some of the clearest freshwater on earth. Visibility regularly exceeds a hundred metres, and the water glows a luminous, almost artificial teal that deepens to cobalt in the cathedral-like crack below. This private snorkelling session takes groups of up to six directly into that glacial meltwater, which holds steady around 2°C year-round, cold enough that the initial plunge tightens your chest even through a dry suit. The underwater photos included in the experience capture something cameras rarely manage on land: the eerie stillness of drifting between continent walls, algae trailing like bright green hair from the rock shelves, every pebble on the bottom razor-sharp against the blue.

This two-day private itinerary runs east along the south coast to Jökulsárlón glacier lagoon and the ice caves of Vatnajökull, a drive that in December means hours of near-darkness broken by the white flash of roadside waterfalls and the occasional taillight ahead on Route 1. At the lagoon itself, icebergs the size of delivery trucks drift past in silence, their surfaces groaning and cracking as they rotate, the exposed blue ice so saturated in colour it looks artificially dyed. The ice caves, accessible only in winter when meltwater has drained and refrozen, are cathedrals of compressed glacial ice overhead, ribbed and translucent, the walls creaking faintly as the glacier shifts. On clear evenings during the return leg, the guide pulls over for northern lights viewing far from any settlement's glow, where the aurora ripples in curtains of pale green and occasional violet against a silence so complete you can hear your own heartbeat.

Reykjavik's food scene concentrates into a few walkable blocks, and this guided tour threads through them with the kind of local knowledge that turns a meal into context. Expect stops that range from a counter serving hákarl, fermented shark with an ammonia punch that hits the back of your throat before the fishy, chewy texture registers, to a bakery where the flatkökur flatbread comes off the griddle with a crackle, buttered and warm, tasting faintly of rye and smoke. The tour covers Icelandic lamb prepared in ways that reflect the island's isolation: slow-smoked hangikjöt with a sweetness that comes from birch wood, paired with dense, tangy skyr that locals eat as casually as yoghurt but with a creamier, almost whipped consistency. Between tastings, the walk itself doubles as an architectural tour of the corrugated-iron downtown, the guides pointing out details, a turf-roofed annex behind a restaurant, a fish-drying rack repurposed as a garden trellis, that most visitors walk past.

The Reykjanes peninsula southwest of Reykjavik has been in a volcanic episode since 2021, and this half-day private tour takes up to nine passengers across a landscape that is, in the most literal sense, still being made. The lava fields near Grindavík are raw and black, their surfaces folded into ropy pahoehoe textures that crunch underfoot like broken pottery, steam hissing from vents where rainwater meets residual heat below. The sulfur smell sharpens as you approach the more active zones, a rotten-egg tang that fades only when the wind shifts. Older formations, moss-covered craters from eruptions centuries past, sit alongside fresh flows that are still warm to the touch through boot soles, the contrast between soft green moss and jagged black basalt startling at close range. In December's low-angle light, the lava fields take on an almost lunar quality, the shadows long and deep, every crack and fold exaggerated.

Chasing the aurora from Reykjavik requires getting away from the city's light dome, and this private tour does the driving and the guesswork for you. A professional photographer guides you to sites selected based on that evening's cloud-cover forecast and geomagnetic activity, sometimes a black-sand beach south of the capital, sometimes a lake inland where the lights reflect off still water, doubling the display. The aurora itself, when it appears, is quieter than photographs suggest: a pale greenish-white arch that brightens and dims, occasionally flaring into rapid curtains of green and pink that ripple like fabric in wind, the whole sky shifting in silence. The photographer handles long-exposure camera settings for you, producing images that capture the full colour your eyes only partially register in real time, the violet edges, the deep-green zenith, and delivers them afterward.

The Golden Circle route, Þingvellir, Geysir, and Gullfoss, is the single most travelled day trip from Reykjavik for good reason: it packs tectonic drama, geothermal violence, and raw hydraulic power into a loop that returns you to the capital by evening. At Þingvellir, the rift valley between the continental plates is visible as a sheer rock wall dropping into a flat, snow-dusted plain, the silence broken only by wind and the occasional crack of ice on Þingvallavatn lake. The Geysir geothermal area smells of sulfur before you see it. The hot springs steam in the cold December air like kettles, and Strokkur erupts every six to ten minutes, a blue dome of water that swells, pauses, then bursts upward in a column of boiling spray that you feel as heat on your face from ten metres away. Gullfoss waterfall, a few kilometres further, drops in two stages into a canyon, the mist freezing on the railings and the roar loud enough to make conversation impossible. In December, ice rims the falls and the spray coats everything in a thin, glassy shell.