J.E.
My daughter goes to a friends party at Independence grove beach. THey have been doing it since she was 5 and they re 8 now. 10 kids and some moms dtay and she has her husband and mom and sister stay too. they get the umbrella reserved and it is reallyfun for them to al be together.
You could always do the mundelein spray park, it is cheep and perfect for that age and I a msure most moms will stay. Another friend did that and she made it a pirate theme and the kds found trasures in the sand, she hid coins she got a twalmart and little treasure boxes and if y ou found one of the five boxes you got a prize and they put all these things in a cute pirate gold carrying bag, etc the ideas are endless and of course goodie bags for the beach one was a bucket and shovel with candy and beach ball etc.