Hat Works Museum
The UK's only museum of hats and hatting, back open after a four-year refurbishment. The galleries are free and you can try hats on; the Victorian factory floor is a £7.50 guided tour. An hour well spent, not a full day.
Museums & science in Stockport
Hands-on museums and science centres. Several of the best ones are free.
Museums & science in Stockport
Stockport Air Raid Shelters
A labyrinth of tunnels carved under the town centre that sheltered thousands in the Blitz, explored with a self-guided audio tour. Atmospheric in the best way for 7-and-ups.
Museums & science elsewhere in the North West
World of Glass
Free, indoors and better than it sounds: interactive science aimed at younger children, glassblowing demos, a picnic area and a small playground outside.
World Museum, Liverpool
Five floors, free, and it covers three things small children reliably love: giant dinosaurs, an aquarium and a space gallery. The best wet-weather day within half an hour.
Catalyst Science Centre
Hands-on science galleries and a glass rooftop observatory over the Mersey. Small, cheap, indoors and close.
Science and Industry Museum
Working steam engines, the story of Cottonopolis, and hands-on galleries in the world's oldest surviving passenger railway station. Free, and the live demonstrations are the bit kids actually remember.
Manchester Museum
A T. rex skeleton cast, live frogs in the vivarium, Egyptian mummies and a genuinely good natural history floor. Free, university-run, and less overwhelming than the big London equivalents.
National Football Museum
Shirts, trophies and match footage across six floors, with penalty shootout and skills games that football-mad kids refuse to leave. If yours do not care about football, skip it - it is exactly what it says.