Yorkshire

We have a caravan at Cayton, so up that way often. There's sealife in Scarborough, which our kids love. There's also Playdale Farm, but we've not been there yet. We've had it recommended a few times.
We've been to a place called Cedar Barn, which is lovely, but your children might be a little small for it. They do lovely pizzas in their airstream, though.
If you want somewhere nice for a coffee and cake, I can recommend Betton Farm. We go there every time we're that way. They have a few animals, a play area and a lovely farm shop and restaurant. Betton is free as it is just a small place but when the weather is nice, we've spent hours as ours just love playing with the cars x