Tour description provided by Viator

Take a day trip from London to Paris by Eurostar train, and explore the city on your own or with a host ! Choose from an independent trip with a Paris hop-on hop-off tour to see sights like the Louvre, or a escorted day trip that includes a city tour, a one hour circular sightseeing cruise and time to explore. The rail trip comes with a Eurostar seat in standard class, or an upgrade option is available to standard premier for more leg room, including light meals.

Independent Day Trip: Travel from London St Pancras to Paris Gare du Nord by Eurostar, and then spend the entire day at leisure. For an ultimate hassle-free day of sightseeing, use your ticket for a Paris hop-on hop-off tour, to get around the city and visit attractions like the Louvre, Eiffel Tower, Champs-Élysées and more. Escorted Day Trip:   

Meet your Evan Evans representative at St Pancras Station before boarding the Eurostar where all you need to do is sit back and relax until you arrive in Paris 2 hours and 15 minutes later.

On arrival at Gare Du Nord, you and your host will board your luxury coach and start your journey in Paris. You will see famous landmarks including the Champs-Elysees, the Arc de Triomphe, Notre Dame, Musee d'Orsay and Place de la Concorde. Your first stop is the Eiffel Tower, where you'll have time to get up close and take plenty of photos. You will have free time to explore the area, may have some lunch. As your host for recommendations. (Entrance to the Eiffel Tower is not included)

In the afternoon, board your sightseeing cruise along the River Seine. You will meander through the heart of Paris taking in stunning panoramic views from the all glass boat with an open air observation deck while listening to the fascinating audio commentary. Disembark your cruise where your bus will be waiting for you to take you to the Opera district, excellent for shopping. You will have some time to shop or more time to explore. Your host will escort you back to Gare Du Nord in plenty of time for you return train back to London.