There is a Metro station, 2 RER (commuter rail) stations and a bus stop within easy walking distance of the dock. Within the central Paris area the RER can be used on Metro tickets. There are many stations where both meet. Up river about a third of a mile there is a RER station Javel, that can be reached by crossing 1 street. Across the street is the Javel Metro station. Down river is the Boulevard Victor RER station, crossing 2 streets, with a bus stiop right next to it. see this MAP of the RER. Boulevar Victor is the last station on this line that shares Metro ticketing. Both of these RER stations are on the line that goes to Versaille. See my blog http://jackthetravelingman-seine.blogspot.com, which includes a map of the area, for a trip report on this wonderful cruise. We would be glad to answer any questions on this trip. It is no problem getting a taxi from the ship, but have the ship call, so that they can give corrrect directions. Several people traveling independently had problems with taxis finding the ship. Honfleur is an absolute treat that very few cruise lines go to.
I notice that, on the web site, both the Paris to Honfleur and Honfleur to Paris Itineraries show the Paris to Honfleur route. Michelle, please inform whoever is resposible.