You can easily spend more time in Paris, but don't miss the other charming cities, especially Lyon and Nice. If you are a wine lover, consider visiting Bordeaux or Champagne region. If you want more nature, add a day trip to Normandy or the Loire Valley. If you have less time, shorten the stay in Nice, Strasbourg, or Luxembourg. This itinerary assumes you have a car, but you can also take trains or flights to save time. Check the opening and closing times in advance and reserve tickets if possible to avoid long queues.