Le Havre is pretty much avoidable - the walk to the downtown area is depressing (the fish heads in the car park of the fishing port area are frankly horrible) - the only redeeming feature of the town is the Eglise St Joseph and the outside of Notre Dame. Don't bother getting off the ship! ...
There is so much already said and written about Paris that I have nothing to add other than how friendly and helpful all the people were that we met. ...
Please, don't call it 'Paris' - that's like calling Southampton 'London'.
It's Le Havre and it's a big port.
That said it has a nice waterfront and boardwalk which goes right up to a shingle beach where there are hundreds of huts owned/rented by the locals, and a stretch of seafront restaurants with reasonable prices. Plus of course ice creams, crepes, waffles etc.
And the weather was good! ...
The hotel, Le Collectionneur, is in a good location for walking the city being close to the Arc de Triomphe, metro and a city park. The facilities and services in the hotel are first class with large and comfortable rooms. There are many tours offered while in Paris allowing you to select areas of your interest. The Versailles tour was a great introduction to the facility, but plan on spending ...
Under normal circumstances, it does require some time to get from the city to the pier. But that only usually involves a 30 minute cab ride or an RER train trip, neither of which is terribly expensive or difficult.. Just keep in mind that when you arrive at the airport, your ship is NOT in the city of Paris, but in a suburb named Le Pecq ...