If your kids are creative and you are in the London area you can visit The National Gallery in London on Sundays. Kids aged 5-11 can take part in Free hands-on art workshops and drawing sessions every Sunday at 11am and 2pm
Entry is free, Families must book places at least 24 hours in advance - you can book online, it's nice and easy.
When are the next workshops?
9 Apr, 11am-1pm or 2-4pm – Real royal silver
16 Apr, 11am-12.30pm or 2-3.30pm – Walking on clouds
23 April, 11am–1pm or 2-4pm - a brief glimpse ..... ( more listed on the link)