What are some must-see activities for someone visiting Paris for the first time?

Visiting Paris for the first time is an exciting experience full of opportunities to explore the history, culture, and beauty of the 'City of Light'.
Some must-see activities for someone visiting Paris for the first time include visiting the Eiffel Tower, the Louvre Museum, Notre-Dame Cathedral, taking a cruise on the Seine River, exploring Montmartre, relaxing in the Luxembourg Gardens, strolling along the Champs-Élysées and visiting the Arc de Triomphe, exploring the Île de la Cité, and taking a walk along the banks of the Seine River.