You should plan it very well so that you don't waste any of your time there. Search in the internet what places in Paris would be very interesting for you. I suggest,t he best place to view Eiffel Tower is in Tocadero. Try to find, a map that will guide you on how to use the Metro system in France. If you have plan of going to Disneyland, one day isn't enough if you have kids. I hope this is useful enough and enjoy!