Inside The Lourve
Paris could just be one of the most difficult cities to spend only 24 hours. It can be difficult seeing everything there is to see in a week in Paris and especially one day. However, there are many attractions and things to do that are close enough to each other that you can still have an exceptional experience with only 24 hours before your next Paris flight.
While you can rent a car, I recommend just depending on public transportation and taxis since it's just for 24 hours. I would recommend renting a car only if you were in Paris longer and planned on traveling outside the city. For your first stop, head to the Champs-Elysées and follow the smell of freshly baked bread and coffee. Start your day off with one of France's famous chocolate croissants. If you want to do any shopping, then this would be the time to do it before the Champs-Elysées starts getting busier and stores get more crowded.
From the Champs-Elysées, it's time to do some sight-seeing. A short walk from the Champs-Elysées is the Grand Palais, a historic exhibition hall and museum, and one of the most notable buildings in Paris. From here, it's a short distance to one of the world's most famous museums: the Louvre. You could spend an entire weekend and still not cover the entire museum, yet a short visit can allow you to see some of the world's most famous pieces of art, such as the Mona Lisa.
From the Lourve, start making your way to the Eiffel Tower, stopping also at the Arc de Triomphe for some photos. While you can get some great views of the Eiffel Tower from the ground, I recommend going to the top to get beautiful panoramic views of the city. Make sure you have a comfortable pair of shoes with you if you plan on going to the top.
As the day starts to wind down, don't let your day come to an end without a boat tour of Paris on the River Seine. A ride along the River Seine is one of the most unique ways of seeing the city, giving you views of the city you just won't have on foot. A boat tour also offers views of some of the best landmarks in Paris, including the Eiffel Tower, Grand Palais, Notre Dame Cathedral, the Louvre, and Pont Neuf, which is the oldest bridge in Paris.
To end your stay in Paris, make your way back to the Champs-Elysées. It's here that Paris comes alive at night. The Champs-Elysées also offers one of the highest concentrations of restaurants and wine bars, making it easy to pack it all in and still have time for a nightcap.