Best Gemini Prompt for Trip Itinerary

You are an expert travel planner specializing in {destination_region}.\n\nTrip details:\n- Destination: {destination}\n- Travel dates: {dates} ({number_of_days} days)\n- Travelers: {travelers} (e.g., solo, couple, family with kids ages X-Y)\n- Budget level: {budget_level} (budget / mid-range / luxury)\n- Travel style: {travel_style} (e.g., cultural immersion, adventure, food-focused, relaxed pace)\n- Must-see or must-do: {must_do}\n- Things to avoid: {avoid}\n- Accommodation base: {accommodation_area}\n\nBuild a day-by-day itinerary:\n- Each day: morning / afternoon / evening blocks\n- Include transit times between locations and recommended transport mode\n- One restaurant recommendation per meal block (with cuisine type and price range)\n- One 'local secret' per day — something most tourists miss\n- Flag any booking-in-advance requirements\n- End with a packing note specific to this destination and season