Reykjavik is a beautiful city with so much to offer. Here's an ideal itinerary for 3 days in Reykjavik:

Day 1:

• Start your day with a visit to Hallgrimskirkja, the iconic church that dominates the Reykjavik skyline. Take the elevator to the top for stunning views of the city.
• Next, head to the Harpa Concert Hall and Conference Centre, a stunning glass building on the waterfront. Take a guided tour or catch a show if there's one on.
• For lunch, try some traditional Icelandic cuisine at Cafe Loki, located across from Hallgrimskirkja. Don't miss the rye bread ice cream!
• In the afternoon, take a stroll through the colorful streets of Reykjavik's Old Town. Check out the Parliament House, the Reykjavik City Museum, and the Settlement Exhibition.
• End your day with a soak in the famous Blue Lagoon, just a short drive from Reykjavik. Relax in the warm, mineral-rich waters and enjoy the stunning surroundings.

Day 2:

• Start your day with a whale watching tour from Reykjavik's harbor. Keep an eye out for humpback whales, minke whales, and dolphins.
• After your tour, grab lunch at one of Reykjavik's many seafood restaurants. Try the lobster soup at Saegreifinn or the fish and chips at Icelandic Fish & Chips.
• In the afternoon, explore the city's art scene. Visit the Reykjavik Art Museum, the National Gallery of Iceland, or one of the many independent galleries around town.
• For dinner, head to Fiskmarkadurinn (The Fish Market) for some of the best seafood in the city.

Day 3:

• Start your day with a trip to the Golden Circle, a popular tourist route that includes some of Iceland's most famous natural wonders. Visit Thingvellir National Park, the Geysir geothermal area, and Gullfoss waterfall.
• For lunch, stop at Fridheimar, a greenhouse restaurant that specializes in tomato soup and other tomato-based dishes.
• In the afternoon, head back to Reykjavik and visit the Perlan Museum, which offers stunning views of the city from its observation deck.
• End your day with a visit to one of Reykjavik's many bars or clubs. Try Kaffibarinn for a cozy atmosphere or Húrra for live music and dancing.

I hope this itinerary helps you plan your trip to Reykjavik!