We almost didn't visit this chateau, but very glad we did. I think it was our favourite overall, having visited 5 in total. This is a fortress/chateau on top of a hill, and commands superb views over Chinon. You can walk all the way down to the dungeons in the bottom of a tower, and all the way up to the turret at the top. Be prepared for a lot of spiral staircases if you want to do this - but it was well worth it!
There is a great video projected presentation in 2 of the rooms at ground level, which kept my 5 year old entertained - she wanted to listen to the entire video 3 times, learning about Henry II (of England) who died here and is buried at the nearby Fontevraud Abbey.
Tips - there is a (paid) car park in the centre of Chinon, which has a lift (elevator) up to the Chateau. You can also park at the top of Chinon in the free car park (you drive around a mile around the outside) and then walk down a cobbled street to the castle. This is much more fun!
Tip 2 - the museum shop was the cheapest of all the chateaus we visited
Tip 3 - there is a great creperie if you continue down the cobbled street. Ideal for lunch before/after. Continue down to the bottom of the hill, and it is diagonally opposite: Creperie du Gand Carroi (Rue du Grand Carroi)
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.