Instructions on seeing the sights in Paris in 4 hours...

1) Miss layover flight to New York and be rescheduled on flight next day at noon (7:00pm)
2) Get put up in Hotel Ibis near the airport with free dinner and breakfast. (8:00pm)
3) Purchase two day All-Day Metro pass for 27.15 Euros and take Metro from Charles de Gaulle airport into Paris (9:00pm)
4) Arrive at the Eiffel Tower, take pictures and await for the tower to sparkle (10:00pm)
5) Get back on the Metro and get off at Musee D'Orsay stop. (11:00pm)
6) Start walking from Musee d'Orsay to the Louvre, then to Ile de la Cite and Notre Dame, taking shots along the way. (12:00am)
7) Head into the Latin Quarter, pick up a late dinner and head back for the hotel (1:00am)
8) Wake up at 6:00am, use your free breakfast, head back into Paris in the pitch black. (7:00am)
9) Get out at the Arc de Triomphe, take your pictures, then head to Monmartre (8:00am)
10) Ascend Monmartre to Sacre Coeur, take photos, descend, and head back to Notre Dame via Gare du Nord (9:00am)
11) Wander around Notre Dame again, Latin Quarter, and Hotel Cluny, then get back on the metro back to the hotel (10:00am)
12) Check out of your hotel, take the bus to the Terminal, hop on a plane, and 8 hours later, wind up back in NY...

Rinse and repeat as needed