Gatwick Airport: OK, so sounds a bit odd, but it’s actually a great, free day out for aeroplane-obsessed tots like ours. No need to fly anywhere, just head to the little mag-lev train that shuttles between South and North terminals. We sat on it for ages, watching the planes. You can also get a great view of the planes taking off from the car parks (!); there’s nice wide corridors to run along; and when you’re ready for refreshment, Cafe Nero in South Terminal does a mean hot choc.