Day 1: Depart from London

• 8:00 AM: Depart from your accommodation in London and make your way to St Pancras International Station.
• 9:00 AM: Arrive at St Pancras International, allowing ample time for check-in and security procedures.
• 10:00 AM: Board the Eurostar train. Enjoy the comfortable journey through the scenic English countryside.
• 11:30 AM: Arrive at Gare du Nord Station in Paris.
• 12:00 PM: Check-in to your Paris accommodation and freshen up.
• 1:00 PM: Lunch at a charming Parisian café.
• 3:00 PM: Explore Montmartre and visit the iconic Sacré-Cœur Basilica for stunning panoramic views of the city.
• 6:00 PM: Dinner at a local bistro, savoring authentic French cuisine.
• 8:00 PM: Stroll along the Seine River and enjoy the illuminated beauty of landmarks like the Eiffel Tower.

Day 2: Discover Paris

• 9:00 AM: Breakfast at a local bakery for freshly baked croissants and coffee.
• 10:00 AM: Visit the Louvre Museum to admire its world-renowned art collection, including the Mona Lisa.
• 1:00 PM: Lunch at a classic brasserie.
• 2:30 PM: Explore the charming Marais district, known for its historic architecture, boutique shops, and art galleries.
• 5:00 PM: Indulge in some shopping along the famous Champs-Élysées Avenue.
• 7:00 PM: Dinner at a gourmet restaurant, experiencing French haute cuisine.
• 9:00 PM: Evening river cruise on the Seine to see Paris landmarks illuminated.

Day 3: Cultural Experiences

• 9:00 AM: Breakfast at a local café.
• 10:00 AM: Visit Notre-Dame Cathedral (Note: As of my last knowledge update in September 2021, the cathedral is undergoing restoration after the fire. Please check its status before your trip.)
• 12:00 PM: Lunch in Le Marais at a cozy creperie or traditional French bistro.
• 2:00 PM: Explore the Musée d’Orsay, known for its impressive collection of Impressionist and Post-Impressionist art.
• 5:00 PM: Relax at a Parisian café with coffee and people-watching.
• 7:00 PM: Dinner at a local restaurant, enjoying regional specialties.
• 9:00 PM: Visit the Eiffel Tower at night to witness its sparkling light show.

Day 4: Farewell to Paris

• 8:00 AM: Breakfast and check-out from your accommodation.
• 9:00 AM: Explore the charming streets of Montparnasse and discover its artistic history.
• 12:00 PM: Lunch at a café with a view of the Eiffel Tower.
• 2:00 PM: Final shopping or sightseeing before departing.
• 5:00 PM: Arrive at Gare du Nord and board the Eurostar back to London.
• 7:30 PM: Arrive at St Pancras International Station in London.

Please note that this itinerary is just a suggestion and can be customized according to your interests and preferences. Also, make sure to check for any travel advisories, opening hours, and updated schedules for attractions and transportation before your trip. Enjoy your journey from London to Paris on the Eurostar!