I live about 10 minutes from Knight's Action Park.
This would definately not be a place where a family with many other water park options would choose to come and visit. Knight's is more for the family that is here touring the Lincoln sites or has other business in Spfld. and wanted to hang out the park for some added fun in their trip. It is mostly families and teens from the immediate area or surrounding communities.
It is a decent little park, but by no means is it a huge water park at all. My kids go there for something to do in the summer. There's the water park, paddle boats, ferris wheel, go carts, driving range, miniature golf, picnicing areas, drive in movie theater and roller skating rink in the area.
What doesn't make sense to me is that the husband and wife has a romantic weekend planned with his/her parents coming to watch the children. So they run out to go the water park and then hurry to meet the grandparents to watch the children while they go to a bed and breakfast. Where was this B&B compared to the waterpark?