Provide arrival/departure airports, train stations, or ports and times so I can plan the first and last day realistically and check opening hours for those dates.
List top interests (museums, food, hiking, architecture, beaches, nightlife) and any must-see attractions so I prioritize them and check opening times/booking requirements.
Any dietary restrictions, mobility limits, or accessibility needs will affect restaurant and attraction choices; tell me so I can recommend suitable options.
Indicate approximate daily budget and whether you prefer local street food, mid-range restaurants, or fine dining so I can recommend breakfast, lunch, and dinner options that fit your price range.