Cycling off from Cancale, you follow minor parish roads up to a fork at the place named Les Boulais where you then head off to Le Vivier-sur-Mer. Note that the circuit through Cancale isn't signposted with the Vélomaritime logo. Also, be careful crossing the larger county roads. After you've reached the fork in the route, then follow the logo signposting the Vélomaritime route.
At Le Vivier-sur-Mer, go to the Petite Cité de Caractère of Dol-de-Bretagne (about 10 km) with a stop at Mont-Dol and its exceptional panorama over the marsh and the whole Bay!
Nearby train stations: Dol-de-Bretagne, la Gouesnière and Saint-Malo.