Playgrounds, country parks, woodland trails and nature reserves. Most of these cost nothing.
South Liverpool's favourite park: lake, playground, ancient trees and the Storybarn, The Reader's hands-on storytelling space in the old coach house. The neolithic Calder Stones are older than Stonehenge, which is a good fact to deploy.
Liverpool's great Victorian park: 235 acres of lake, streams and playgrounds around a glass Palm House full of palms, statues and free family events. The fairy glen with its waterfalls is the bit children remember.
A Tudor hall with woodland walks, a maze and a natural play area in the grounds. Free if you have National Trust membership, and the indoor house is a good rain fallback.
A prehistoric trail winding through a garden centre, with interactive bits along the way. Under-2s free, and there's a café and indoor shelter if the weather turns.
The reliable default: gardens, a children's zoo, a big playground and plenty of room to run. Pay for parking, nothing else.
Inflatables in Old Market Square every day, plus a rotating Wednesday programme across the parks and a Thursday session in Time Square. No tickets, no booking, just turn up.
A peat bog nature reserve with woodland trails, a visitor centre and an observation tower the kids can climb. Free, close and short enough for little legs.
St Helens' biggest park. Play areas, open space and a walled garden, and it costs nothing.
A 20-metre white head rising out of a reclaimed colliery, with woodland trails around it. Genuinely strange and memorable for kids, and a short walk rather than a hike.