We are travelling to Paris for a day by Eurostar arriving into Gard du Nord. We weill have two children with us (14 and 9) and would like to include the Eiffel Tower and Le Louvre. We are happy to do as much on foot as possible, but help and advice with the best order to do things in, metro stations needed etc greatly appreciated. It is very short notice but too good an opportunity to miss. Also advice where to eat-and when (it will be a Saturday!) Thank you.