In reply to ghisino: He also doesn't know the local public transport very well either (not surprising given his preference for having a car I suppose)
"Charles de Gaulle - A lot of discount carriers fly to CdG. If you fly into CdG, make sure you have a map for the drive to Font. You basically have to go due south on the 104 towards Disneyland Paris and Melun, avoiding Paris itself. Maybe an hour with little traffic? If you have ignored everyone's advice, and are car-less, you have to somehow get to Gare du Lyon - I think there is a bus - from here you pick up the train to Bois le Roi and Font."
A short search of the numerous threads about 'bleau will explain the easiest way from CDG - RER ligne B (train) to Chatelet - Les Halles followed by RER ligne A to the Gare de Lyon - very easy & likely to take about 30 minutes. Otherwise there's an AirFrance operated bus but usually much slower.
Beauvais airport is in the north of Paris and the most inconvenient for Font. I think you get a bus to Chatelet or something, and then get to Gare de Lyon for the train to Font. Driving would be a pain because you have to go through Paris"
clearly he's never caught the bus ! its goes to Porte Maillot from where the easiest is to take the Metro (ligne 1) to the Gare de Lyon.
Its also worth noting that since the start of the year, some trains which used to stop at Bois les Rois, don't anymore (including the 09.06 on a Sunday morning