Beacon Country Park
Over 300 acres of woodland, meadow and proper hills on the slopes of Ashurst Beacon, with inclusive play areas and a cafe by the car park. Free in, free parking, and enough path network to tire out anyone.
2 places in Ormskirk, Lancashire, 1 of which cost nothing. Everything below is within easy reach if you live locally.
Ormskirk is a market town with a gingerbread habit and one big family card just outside it. Farmer Ted's is the paid day, a farm park built squarely for the under-tens with enough under cover to survive Lancashire weather. Beacon Country Park rolls across the hill above town with trails, views to the coast and enough space to wear a family out for free.
The wetlands are the local secret that is not very secret. WWT Martin Mere is ten minutes away in Burscough, otters and flamingos and canoe safaris in season, with Windmill Animal Farm and its little railway close by. Southport's beach is twenty minutes west. Ormskirk itself offers a market, gingerbread, and a church with both a spire and a tower; the days out ring the town rather than fill it.
Over 300 acres of woodland, meadow and proper hills on the slopes of Ashurst Beacon, with inclusive play areas and a cafe by the car park. Free in, free parking, and enough path network to tire out anyone.

Built precisely for the under-9s: animal encounters, giant jumping pillows, tractor rides and a big indoor play barn that rescues wet days. Older siblings will tolerate it; little ones adore it.
Not in Ormskirk, but close enough for a day out.

The big one. Nickelodeon Land covers the primary ages properly while the Big One and the wooden coasters wait for brave older kids. August queues are real; go in expecting them and it is a great day.

The Tower Eye's glass floor 380 feet up, a proper circus that still knows how to play to kids, and the famous ballroom below for a fancy ice cream. Buy the attractions you want rather than the bundle you will not use.

The UK's biggest indoor waterpark, kept at tropical temperature: proper toddler pools and mini slides at one end, big flumes at the other. Rainy-day Blackpool solved.

Elephants, gorillas, giraffes and sea lions in 37 acres that are actually walkable with primary-age legs - big enough to feel like a full day, small enough that nobody ends up carried.

A solid seafront aquarium with an ocean tunnel and rockpool sessions - the reliable wet-weather hour when the beach plan falls apart.

Blackpool's grand free option: Italian gardens, a big boating lake, one of the best playgrounds on the coast and model boats on the lake. The antidote to a wristband day.

Otters at feeding time, flamingos, pond dipping and a canoe safari through the reeds in season. One of those places that quietly turns a nature-indifferent child into a nature child.

A friendly hands-on farm whose star turn is the miniature railway running out across the fields. Animal handling sessions, indoor play for wet spells, and it never feels too big.