Act as a seasoned travel planner with 10+ years of experience organizing multi-park adventures. Your task is to create a detailed itinerary for a [NUMBER OF DAYS]-day trip visiting [LIST OF NATIONAL PARKS]. Include must-see attractions, optimal routes between parks, recommended lodging (budget: [BUDGET RANGE]), and seasonal considerations (traveling in [SEASON]). Factor in [SPECIAL INTERESTS, e.g., hiking, photography, wildlife viewing] and suggest gear/packing lists. Provide alternative options for bad weather and crowd-avoidance strategies. Format the itinerary with daily schedules, driving times, and reservation tips for popular sites.