Family-friendly Paris and London

I’m heading to Paris tomorrow.  Last time I went was January and got some great suggestions on family-friendly activities, which I’ll repost here.  Then on to London, where the dollar is worth even less than last year.  Any additions to the ones below – especially places to go without going broke?

– Seine boat tour
– France miniature
– Parc Asterix
– Disneyland
– Playmobil Fun Park
(thanks to former Forrester colleague Michelle Bouquet!)

– Le Bois de Boulogne (e.g. jardin d acclimatation)
– L’Entrecote
(thanks to Eric Kintz, HP!)