If the day's weather forecast is grim, why not spend the day at La Grange aux Dîmes? You'll be surprised just how many interesting facts you can discover about days gone by here.
This Provins collection of historical artifacts is a good spot to begin your day of sightseeing. There's plenty to do and see in the vicinity, like La Roseraie de Provins, Cesar Tower, and Église Saint-Quiriace. Wander around at your leisure at La Grange aux Dîmes before making tracks to these other fine sights.