One night in Paris before flight from CDG

If it were me, I'd stay in the city. Have a nice dinner and a stroll and even perhaps have some time to do something you've not done in Paris before dinner.

If you're comfortable using the RER to the airport, you could stay somewhere along the route and take the train to the airport in the morning. I always recommend the Henri IV RIve Gauche on the r. St. Jacques. It's a 3-in walk to the RER station at St. Michel.

https://henri-paris-hotel.com/

If you'd rather take a taxi, you can stay anywhere in the city, although if you stay in the northeast quadrant (think Marais or Bastille areas) your taxi will be able to avoid a lot of morning traffic. A taxi from the Right Bank will be €56 plus a reservation fee of €7. You can download the G7 app or call them on the English-speaking line at 01 41 27 66 99. The important bit is to make sure to reserve your taxi 2 days prior. There can be a shortage of taxis, so no availability, at the moment.

IF you decide to stay at the airport, then stay AT the airport, not close to the airport.

In April I stay at the Novotel CDG. A two minute covered walk from the RER B station and a 2 minute covered walk to the Roissypole tram to the terminals. It was clean, quiet and comfortable with a nice breakfast buffet.

That's a tough one because spending the afternoon/evening at the airport is just depressing when Paris is that close :)

If you do stay at the airport make sure it's on the CDG Val line

Here are my reviews on the airport hotels that i have personally used

Sheraton - Great location and they know it. Overpriced, poor service , rooms need a redo
Hilton - My favorite but generally a little high :)
Holiday Inn Express - Easy commute on the CDG Val and good price. Room was in good location and it's close to other hotels so you have a couple of food options.

Good Luck

If you were arriving late in the evening I would recommend just staying at the airport -- but arriving early afternoon? Drop your luggage at your room in Paris, then enjoy an afternoon doesn't something you enjoy about Paris -- a museum, sitting in the Luxembourg Gardens reading a book, taking a walk in one of the many 'Paris walks' books -- or just strolling by the river. Get a nice dinner and night's sleep. Arrange for a cab on G7 to pick you up at 5:30 the next morning.

Or come into Paris and stow your luggage at Gare du Nord and enjoy the afternoon and dinner and then take the RER B to the airport and go to one of the hotels at Roissypole. We usually stay at the Novotel when we do this. Quiet, clean, decent breakfast and literally steps from the CDG VAL to the terminal.

If you do the second which I would with a 9:25 flight then make sure the luggage storage is open when you want to pick up the bags.

Thank you all for the great input. I think I'm leaning towards staying in the city and scheduling a taxi for the morning drive to the airport. It would be a shame to be so close and not see any of all that Paris has to offer. Carol, you helped me realize that just hanging out at the hotel for the afternoon and evening would be "depressing" Happy, thank you for the information on scheduling the taxi. We have been to Paris multiple times however, I'm at the stage in my travels where I can slow down and just enjoy where I am and not have a list of " must see" places.
Again, thank you for taking time to reply.

we always schedule the G7 taxi for CDG two days ahead; sometimes cars are not available the night before -- they have an English line or you can do it on line. The phone from an American number is: +33 1 41 27 66 99. They are very reliable in my experience.

If you have any interest in aviation history don't go into the city. Get a room at CDG, and take a cab over to La Bourget and visit the French Air and Space Museum. It's excellent, and open until 6pm. Then go have a meal, which if you do it right will last until after 8pm, and get some sleep.

https://www.museeairespace.fr/