On our last day in Paris, we're flying out of Orly at 6:30pm. To make the most efficient use of the day, I'm thinking we could take a morning train to Melun and see Blandy-les-Tours and Vaux le Vicomte and take a train from Melun to Villeneuve at 3pm and take a cab from there to Orly to arrive at the airport by 4pm.
Questions: Is this a bad idea (or a great one)? Is there a place to store our luggage at the train station in Melun? Thanks!