I am trying to decide on a cruise in September. If I do take it, I will end up in Cherbourg on a Monday (12 hours in port). Is it feasible to try to take the train to Rouen? As a fan of Impressionism and Monet in particular, I would love to see the Rouen Cathedral. However, I don't want to waste too much time or money to get there. Would there be enough in Cherbourg to keep busy, without any money spent on admissions or tours? Taking to the train to Le Havre would also be an option. Thanks in advance!