hope i'm not too late:
aside from kaiser's (which is the only "sit down" pizza place) and jimanos, there is Mike's Pizza, which is a waukegan place with a gurnee branch in a very obscure strip mall.
nothing fantastic but i would describe the pizza as "scarfable". party cut, thin crust, ok sauce and greasy, see through the bag kind of melted cheese.
mike's pizza
34409 N Old Walnut Cir
Gurnee, IL 60031
(847) 548-9200
Also there is Bill's Pizza/Pub with two locations slightly west of gurnee. I've only been to the mundelein one but found the pizza acceptable. crackery thin crust, but the double-decker is very filling. might be interesting for the kids, the decor is hunter's lodge with quite a bit stuffed/mounted animals.
note that they offer free peanuts and you can throw the shells on the floor. if you or your family has peanut allergies, do not go here.
http://www.billspizzapub.com/