The most comfortable way to see all of Paris is the metro. I suggest you use it for all shifts!
Visit the Eiffel Tower. Notre Dame ... the Louvre Museum ... go out at night and if you're near the Eiffel tower ... well look at it is wonderful! The light is fantastic!
Also visit Disneyland Resort Paris, is wonderful, beautiful, full of games suitable not only for children; Eat the crepes, they are delicious. Visit the gardens of Versailles, romantic and beautiful and above all do not forget to take the bateaux mouches, the ferry that will make you ride on the Seine ... amazing!