Stop off return from Cornwall

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Looking for recommendations please for stop off on the journey back from Cornwall back to Manchester region. We have two dd ages 5 and 7.

Maybe theme park or similar, thanks

At Junction 13 of the M5 there are a few good options. We like Cattle Country Adventure Park - giant slides and soft play indoors while outdoors you’ll find play a climbing net, ride on mini tractors, willow maze, adventure castle and a boating lake, plus lots more. There are plenty of animals too.
Just half a mile from junction 21, Puxton Park is a great one if it's wet as there’s plenty of indoor activities - slides, mouse tunnels and obstacle courses to name but a few. If it’s dry you’ll need a full day to make the most of everything. Outdoors there are pillow trampolines, a mini railway, bumper boats, zorbs and rowing boats. Animal lovers can feed rabbits and guinea pigs, ride ponies or meet owls. Meadows restaurant serves meals all day and there’s also a farm shop on site if you want to stock up on fresh groceries.