A.T.
We LOVE Apples on Oak. The address is Joliet but that's unincorporated, it is basically in Lockport. It is a small family owned and run. No cost to go in the orchard. There are 2 very friendly dogs that trot around and greet everyone. It kind of reminds me of what you would expect your grandma's apple orchard to be...the grass is long here and there-- it doesn't have that commercial feel of most places...there's no wagon rides or petting zoo or anything like that--it's just plain old fashioned apple picking. The varieties are not common ones so that's nice. It is open on Wednesday, Saturday and Sunday.
Our girls love it and beg to go. I took my Brownie Scouts last year and the girls had a ball. You didn't mention exactly where you are--but it is on Oak Avenue which is off Gouger just south of Highway 6. Here's the web site. http://peceniak.tripod.com/
Try it--I bet yor kids will love it.