SHORT VERSION: Cheapest + fastest way into central Paris on a Monday morning (9:20am) from ORLY with minimalist carryon baggage?
FULL VERSION: My husband and I are ending our honeymoon with one long layover day in Paris. Landing at ORLY 9:20am local time on a MONDAY, departing CDG 7:45pm the same day. I simply want my husband to see a glimpse of the city, eat a pain au chocolat, maybe wander into a historic library (the Opera Garnier is closed that Monday, sadly) or cultural center, then grab a bus or train out to CDG. I know we'll be fighting against rush hour traffic, so I suspect trains are the better choice so we don't waste our time hung up in traffic, right? I am 6 months pregnant but used to being active and plan to walk a bit on this day. However, if a Lyft or Uber is competitive on price, I would be open to the possibility (but again, traffic seems to be the main issue). Merci beaucoup!