I arrive early Sunday morning around 5:40 and am staying in Versailles. My plan is to drop my bag at the hotel in Versailles and then head back to Paris to see the Louvre etc. and use the whole day. What card/pass do you recommend I purchase at CDG Airport? I will not be travelling back into paris for the week afterwards but rather staying in Versaille mainly
The Paris Visite Ticket 1-5 zone 1 day will cover your travels from CDG Airport to Versailles then back to Paris, then back to Versailles the same day.
After that, for your week in Versailles, you can purchase a Navigo for zones 4-5 which would cover you for travel within Versailles for Monday till Sunday.