Dinan has a river port on the Rance River running inland from St Malo
the port has many restaurants along the quayside, together with a fantastic boulangerie where you can buy the local Kouign-amann (a sticky breton bun, that they once made as the technical challenge on the Bake-off!)
You can hire little motor boats for a river trip or go on an excursion on the Jaman V boat whose commentary explains a little history of the area and finishes off with accordian playing.
The Rue du Jerzual is a pedestrianised cobbled street which takes you up the hill into the town.
Thank you to my good friend Pete Tachauer for the beautiful photos of the port https://www.flickr.com/photos/pete_tachauer/