A quirk of history means that this is one of the best preserved castles anywhere. You do need to go on the guided tour to see all of it. The tour is in French so young children (even French ones !) may get bored. The guide tried hard to be entertaining - a big problem when the castle was besieged was a lack of fromage frais ! On the other hand there's acres of space for young musketeers to let off steam in.
Unlike similar attractions in the UK, there is no cafe. There's lots of space outside for a picnic.