My husband and I will be visitng Paris for 4.5 days in late March. I am afraid that we will run out of things to do! Most "sample" itineraries are for 3 days. We plan on covering all of the usually recommended places like the Louvre, Eiffel Tower, d'Orsay, Notre Dame etc. Any ideas for things we should check-out that are not listed on most itineraries found in books, on the web, etc.? My husband and I are in our late twenties and he is a history buff! I would also welcome any suggestions you may have for "night-time" activities...shows, clubs...we are on a "newly-married couple" budget. ;) Thanks a bunch!