Jimmy Doug
If you know what's good for you ...
I think the best way into Paris would be via the north west. Head to Gornay-en-Bray and then to Gisors. From there go to Magny-en-Vexin and onto Cergy Pontoise. The Bray area is on the border between Picardie and Normandie and the countryside is very typically normand with rolling hills and timber-framed houses. Very pretty indeed. While you're in that area you could make a detour to Gerberoy, reputed to be one of the most picturesque villages in France. The area around Gisors is very pleasant too, but Cery Pontoise is grotty and very busy. From there it's best not to deviate from the path indicated here.