Paris is easy to navigate using public transportation such as the metro and bus system. A 2-day unlimited travel pass can be purchased for €20, and taxis and ride-sharing services are also available. Keep in mind that traffic during peak hours can be heavy and travel times may vary.
If you have more time, consider visiting the Notre-Dame Cathedral, taking a boat tour on the Seine River, or exploring the Montmartre neighborhood. If you have less time, prioritize visiting the Louvre and Eiffel Tower on day 1, and Versailles and Champs-Elysées on day 2. Reservations for Le Jules Verne and Frenchie should be made in advance.