Also suprised nobody has mentioned this, maybe an animal show. I rember going to Sea World Ohio 2 years before being bought by Six Flags that they had a nice dog and cat show, and it was fun and entertaining. Family entertainment is at an all time high. (another reason people are mad at Geauga Lake because they have no animals).
Other things that could be considered, is scenery, clean parks, top notch staff (as said above), friendly staff, wide variety of food, nice flats, small coaster. Those are just some things that come to mind. A entertainer (like snoppy, taz, ect) would also make the little ones happy.
Families is truley where the money is, why have one spend when you can have 4 spend. And that is who you need to appeal to. Most park even with tall thrilling coasterstarget families. Most parks are family parks including Cp and SFGA. They have great rides but they want the people who are going to spend.