Beaches: Brittany's coastline is scattered with wonderful beaches: in particular, the Cote de Granit Rose, with its bizarre pink rock formations and gem-like beaches, is perfect for kids.
Interactive museums: Rennes' Espace des Sciences is a peculiar sort of scaly volcano that contains two floors of interactive scientific displays that change each year - and is brilliant for kids.
Aquarium and zoos: St Malo's Grand Aquarium is an entertaining place, where you can either learn interesting facts about slimy monsters of the deep or simply pull faces back at them. Océanopolis, in Brest, features a Tropical Pavilion, with a tankful of ferocious-looking sharks plus a myriad of rainbow-hued smaller fish and a Polar Pavilion, complete with penguins.