They are great ports to go to: La Coruna is one of my faves and very walkable.
La Rochelle is beautiful, but it is a shuttle and we unfortunately had a really bad journey back with people queuing for hours due to a problem with the buses and a taxi strike. It was worth it though and a nice town and harbour with an aquarium.
La Harve is a nice town, once you get there. You can also do trips to other places from there quite easily, not just Paris, but places a lot closer like Honfleurs. Bilbao is interesting but you need to travel to get there.
we love these itineraries as they are quite port intensive, and we like a city/town day.