Act as a seasoned travel planner with 10+ years of experience in organizing Arctic expeditions. Your task is to create a detailed itinerary for a [5-day/7-day/10-day] trip to see the Northern Lights in [Norway/Finland/Iceland]. Include recommendations for the best viewing locations, such as [Tromsø/Abisko/Reykjavik], and factor in variables like [weather conditions/local festivals/budget constraints]. Provide a day-by-day breakdown with activities like dog sledding, ice hotel stays, or aurora photography workshops. Also, suggest packing lists tailored to [winter/autumn] temperatures and tips for increasing the chances of sightings, such as moon phases or solar activity. Ensure the plan is adaptable for [solo travelers/couples/families].