**Day 1: Departure from Seattle**
Depart from Seattle and embark on your journey to France. Arrive in Paris, the romantic city of lights. Transfer to your accommodations at the Hôtel Plaza Athénée, offering Eiffel Tower views and a prime location near Avenue Montaigne.
**Day 2: Explore Paris**
Spend the day exploring Paris. Visit iconic sites like the Eiffel Tower, Notre-Dame Cathedral, and the Louvre Museum. Enjoy dinner at a sidewalk cafe in Saint-Germain-des-Prés.
**Day 3: More Paris Sightseeing**
Visit Montmartre, enjoy the Sacré-Cœur Basilica and the artist-filled square, Place du Tertre. Spend your afternoon exploring the charming Marais district. In the evening, take a Seine river cruise for a different perspective on the city.
**Day 4: Day Trip to Versailles**
Take a day trip to the Château de Versailles. Tour the opulent palace and explore the expansive gardens. In the evening, enjoy a romantic dinner in Paris.
**Day 5: Travel to Loire Valley**
Transfer to the Loire Valley. Check into the Château de Pray, a historic castle turned luxury hotel. Spend the afternoon exploring the nearby town of Amboise.
**Day 6: Châteaux Tour**
Spend the day touring the famous châteaux of the Loire Valley, including Château de Chenonceau and Château de Chambord. Enjoy wine tasting at local vineyards in the evening.
**Day 7: Travel to French Riviera (Côte d'Azur)**
Take a train to the French Riviera and check into the Hotel Negresco in Nice. Spend the afternoon relaxing on the beach or exploring the old town (Vieux Nice).
**Day 8: Explore Nice**
Visit the vibrant Cours Saleya market and climb up to the Colline du Château for panoramic views of Nice. Spend the afternoon relaxing on the beautiful Mediterranean beaches.
**Day 9: Day Trip to Monaco**
Take a day trip to Monaco. Visit the Prince's Palace, the Monte Carlo Casino, and enjoy a stroll around the harbor. Return to Nice for the evening.
**Day 10: Day Trip to Saint-Paul de Vence and Cannes**
Spend the day exploring the charming hilltop village of Saint-Paul de Vence. Later, head to Cannes, known for its famous film festival, and walk along the Boulevard de la Croisette.
**Day 11: Leisure Day in Nice**
Enjoy a leisurely day in Nice. Consider visiting the Matisse Museum, or simply enjoy the city's beaches and cuisine.
**Day 12: Travel to Paris**
Travel back to Paris and check into the Le Meurice for your last night in France. Enjoy a farewell dinner at a Michelin-starred restaurant.
**Day 13: Departure**
After a morning of leisure, transfer to Charles de Gaulle Airport for your return flight to Seattle.
*This itinerary is a suggestion and can be personalized to cater to individual preferences and interests. As always, remember to respect the local culture and environment during your travels.