Second votes for
Foret De Ville Cartier climbing and bikes
Fougere Castle
Mont St Michele in the evening is lovely, hellish busy in the day – If the weather is nice park at this moulin (48°35’06.7″N 1°30’20.7″W) and cycle in along the river then over the causeway to avoid park and ride tourists – take a lock and have a walk round the mont.
St Malo – old town and Saint Servan district are nice
Dinan and Dinard – nice walk or ride from open air municipal pool at Lehon
Good walk and view of MSM from mont Dol
Sandyachting is fun at Cherrueix
Good walk and view of MSM from Mont Dol
Best beaches are on the north coast between St Malo and Cancale -this one’s my favourite – Plage de La Touesse Rozven
Good swimming pool at Fougere if the weather is rubbish.
If you have kids (or just like rides and slides) parc cobac is fun
Eat – if you like seafood go to Cancale for lunch and choose from loads of restaurants or have some fresh oysters on the jetty.
Really good pizza restaurant at Ducey and steak on the fire bistro at Genets
For something posher we’ve had nice meals at Saint-Quentin-sur-le-Homme, Pontorson, Fougeres and combourg but chefs change and restaurants close quite regularly so I’d use tripadvisor.