We will be on a cruise ship in September that docks in Le Havre. We want to explore the Normandy region, and would like to visit Rouen and Honfleur given that they are both reasonably close to Le Havre. Is it possible to get to both of these locations using public transport (train or bus) on a weekday? The ship is docked for 13 hours so we can realistically expect to have 12 hours (at most) to explore. We realize that this would be a rapid pace and we are comfortable with that, as long as we could spend several hours in each city.
If seeing both cities would not be possible, which would be more highly recommended? Honfleur looks beautiful, but I would love to see the Rouen Cathedral in person after viewing Monet's versions.
Any advice would be appreciated!