Plan a trip itinerary

Help me plan a [NUMBER]-day trip to [DESTINATION] for [WHO IS TRAVELING]. Interests: [INTERESTS]. Pace: [RELAXED / BALANCED / PACKED]. Rough budget: [BUDGET]. Dates or season: [WHEN].

Give me a day-by-day outline grouped by area to limit travel time, with one backup idea per day and a short packing and booking checklist. Hours, prices, and entry rules change, so mark anything I should confirm with the official source.