10-day itinerary for experiencing the Northern Lights, focusing on prime viewing locations:

Day 1: Arrival in Reykjavik, Iceland

- Fly into Reykjavik: Settle into your accommodation.

- Explore the city: Visit Hallgrímskirkja, Harpa Concert Hall, and the Sun Voyager.

Day 2: Golden Circle Tour

- Þingvellir National Park: Explore the rift valley and see the Silfra fissure.

- Geysir Geothermal Area: Witness the Strokkur geyser erupt.

- Gullfoss Waterfall: Enjoy the stunning waterfall views.

Day 3: South Coast Adventure

- Seljalandsfoss and Skógafoss Waterfalls: Visit these iconic waterfalls.

- Reynisfjara Black Sand Beach: Marvel at the basalt columns and sea stacks.

- Nighttime Northern Lights Hunt: Head out for your first chance to see the auroras.

Day 4: Glacier Lagoon & Diamond Beach

- Jökulsárlón Glacier Lagoon: Take a boat tour among the icebergs.

- Diamond Beach: Walk along the shore covered in ice chunks.

- Northern Lights Viewing: Stay overnight nearby for optimal viewing conditions.

Day 5: Return to Reykjavik

- Drive back: Enjoy the scenic route back to Reykjavik.

- Relax in the Blue Lagoon: Unwind at this famous geothermal spa.

Day 6: Fly to Tromsø, Norway

- Travel to Tromsø: Arrive in the Arctic capital of Norway.

- Explore the city: Visit the Arctic Cathedral and Polaria.

Day 7: Tromsø Activities

- Dog Sledding or Snowmobiling: Experience Arctic adventures.

- Visit the Tromsø Museum: Learn about Sami culture and the Northern Lights.

- Northern Lights Chase: Join a guided tour for optimal viewing.

Day 8: Lyngen Alps

- Day trip to Lyngen Alps: Enjoy stunning landscapes and outdoor activities.

- Return to Tromsø: Prepare for another night of Northern Lights viewing.

Day 9: Alta or Kirkenes

- Travel to Alta or Kirkenes: Explore the area's unique attractions.

- Visit the Northern Lights Cathedral: Learn more about the phenomenon.

- Last Northern Lights Hunt: Spend your evening searching for the auroras.

Day 10: Departure

-Return to Tromsø or Oslo: Depending on your flight arrangements.

- Last-minute shopping or sightseeing: Enjoy some final moments in Norway before flying home.

Tips:

- Stay flexible: Weather can change rapidly; be ready to chase clear skies.

- Dress warmly: Layer your clothing to stay comfortable in the cold.

- Photography gear: Bring a good camera and tripod for capturing the lights.

This itinerary provides a mix of culture, adventure, and multiple opportunities to witness the Northern Lights across different locations. Adjust based on your interests and travel pace!