3 Days in Reykjavik: Midborg & Sky Lagoon, the Golden Circle, Plus South Coast Waterfalls

With three full days based in Reykjavík, you can dedicate your first day entirely to the capital's walkable waterfront, Viking archaeology, and geothermal bathing, and spend Days 2 and 3 exploring Iceland's two signature scenic corridors: the tectonic rift and geysers of the Golden Circle and the glaciers and black-sand beaches of the South Coast.

Day 1: Hallgrímskirkja, Miðborg Walk, 871 CE Viking Longhouse, Harpa & Sky Lagoon

• 09:00, Hallgrímskirkja, Rainbow Street & Austurvöllur: Start with cinnamon snúður at a Skólavörðuholt bakery, ride the lift to the top of 74.5-metre Hallgrímskirkja, and stroll down Skólavörðustígur (Rainbow Street) and Laugavegur to Austurvöllur Square, the 1881 Parliament House, and the giant 3D relief map of Iceland inside City Hall on Tjörnin lake.
• 12:30, Settlement Exhibition (871±2), National Museum & Old Harbour: Eat a lamb hot dog ("eina með öllu") at 1937 Bæjarins Beztu Pylsur or steaming kjötsúpa lamb soup, descend into the excavated Viking longhouse at The Settlement Exhibition and visit the National Museum of Iceland, then walk past the Old Harbour to Harpa Concert Hall and the Sun Voyager.
• 17:00, Sunset Soak at Sky Lagoon (or Sundhöllin) & Aurora Watch: Spend two hours in the oceanfront geothermal infinity waters and 7-step Skjól ritual at Sky Lagoon (or rooftop 1937 Sundhöllin), followed by a Northern Lights outing if visiting between September and mid-April.

Day 2: The Golden Circle (UNESCO Þingvellir Rift Valley, Strokkur Geyser & Gullfoss)

• 08:30, Þingvellir National Park (930 CE Alþingi & Tectonic Rift): Drive 45 minutes north-east on Route 36 into UNESCO-listed Þingvellir to walk between the North American and Eurasian tectonic plates along the Almannagjá gorge past the Law Rock (Lögberg), Öxarárfoss waterfall, and the crystal-clear Silfra fissure.
• 12:30, Haukadalur Geothermal Field (Strokkur) & Gullfoss Waterfall: Watch Strokkur Geyser erupt a 25-metre column of boiling water every 6 to 10 minutes, stand beside the roaring two-stage cascade of Gullfoss, and return via the 3,000-year-old red volcanic crater lake of Kerið.

Day 3: South Coast Waterfalls & Reynisfjara Black-Sand Beach (or Whale Cruise & Perlan)

• 08:00, Seljalandsfoss, Skógafoss, Sólheimajökull & Reynisfjara: Follow Route 1 east along the South Coast to walk behind 60-metre Seljalandsfoss (May to October), admire the rainbow mist of Skógafoss, view the crevasses of Sólheimajökull glacier, and inspect the hexagonal basalt cliffs of Reynisfjara near Vík (or choose a shorter day combining a morning Faxaflói whale-watching cruise, the Perlan Ice Cave, and the Blue Lagoon).