Begin at Hallgrímskirkja, Reykjavík's iconic hilltop church inspired by Iceland's volcanic landscape, particularly its basalt lava columns. Ride the elevator to the observation tower for panoramic views across the city's colorful rooftops, surrounding mountains, and coastline.

From the church, stroll along Skólavörðustígur Rainbow Street, one of Reykjavík's most photographed streets, before continuing along Laugavegur, the city's main shopping and dining district. Browse Icelandic design boutiques, bookstores, cafés, and specialty shops while experiencing the relaxed atmosphere of downtown Reykjavík.

Optional add-on: Visit The Settlement Exhibition, an archaeological museum built around the remains of a Viking-era longhouse that explores Iceland's earliest settlement and medieval history.

Continue toTjörnin, Reykjavík's city pond surrounded by walking paths, public buildings, and abundant birdlife.

From there, make your way toward the waterfront for a scenic walk that includes the Sun Voyager stainless steel boat sculpture, Harpa concert hall with its striking glass facade, and the lively Reykjavik Old Harbour district with cafés, fishing boats, whale watching vessels, and waterfront views.

Stop near Harpa for an Icelandic hot dog, typically topped with crispy fried onions, raw onions, sweet brown mustard (pylsusinnep), ketchup, and a creamy remoulade sauce.

Spend the evening relaxing at the Blue Lagoon, one of Iceland's most iconic geothermal spas. Advance reservations are necessary, particularly during summer and peak travel seasons.

If your flight arrives early in the morning, it may be more convenient to head directly from the airport to the Blue Lagoon before continuing into Reykjavík to explore the city.

Head to the Sky Lagoon for sunset views and to spend the evening relaxing in one of most celebrated geothermal spas. Although the Blue Lagoon is more iconic, the Sky Lagoon is closer to central Reykjavík and has panoramic sunset views.

Get an early start for Þingvellir (Thingvellir) National Park, a UNESCO World Heritage Site where the North American and Eurasian tectonic plates gradually separate. Explore walking trails through lava fields, dramatic rift valleys, and the site of Iceland's historic parliament before continuing toward Haukadalur Geothermal Valley, home to the Geysir geothermal area and the regularly erupting Strokkur geyser.

Optional add-on: Visit Brúarfoss, a waterfall known for its vivid blue glacial water and picturesque setting.

Continue to Gullfoss, one of Iceland's most famous waterfalls, where glacial water plunges through a dramatic canyon. On the return journey to Reykjavík, stop at Kerið Crater, or Kerid, whose colorful volcanic slopes surround a striking blue crater lake.

Return to the city and enjoy dinner in the Reykjavík Old Harbour district, where many restaurants specialize in fresh Icelandic seafood alongside international cuisine.