Per advice from this forum, we will arrive at CDG at the crack of dawn but NOT rent a car that morning. Instead, we will take a train to Bordeaux and pick up a rental car at the station the next morning Monday 21 aout.
Our current reservation is to return the car on Sunday to CDG with plans to take the RER close to our vrbo on Rue St, Montmorency in the Marais.
But now I am wondering if we would be better off returning the car to Gare du Nord. Thoughts?