Paris has an excellent public transport system, so getting around the city is straightforward. You can take the metro, buses, or even bicycles to navigate the city. Expect to spend around €10-15 on transportation throughout the day.
If you have more time, you could consider visiting other significant landmarks such as the Palace of Versailles or the Orsay Museum. If you're traveling with children, Disneyland Paris is an excellent destination to consider. However, if you have less time in the city, consider skipping the Seine River Cruise and spending more time at the Louvre or exploring more of the Parisian streets. Don't forget to bring comfy shoes as you'll be doing a lot of walking.