Puy du Fou is amazing if you are taking kids.
Roman amphitheatre with chariot racing, Viking long ship battle, mediaeval stuff. Loads of themed shows in different areas covering different eras.
A much better day out than Disney or any UK theme park (unless you are looking for rides, they don't do those).
The night time Cinescenie show has 2,550 actors on a stage spread over 23 hectares with 28,000 costumes.