Sorry to go off-topic. I see you're in IL, too
It's actually perfectly legal to leave kids under 14 alone in IL. It's a really weirdly worded law. In certain circumstances, it may be concerned neglect to leave a child under 14 alone, but authorities look at a list of factors to determine if there was actually any neglect. Even DCFS says the law is purposely ambiguous because each case is unique. My older DD has several friends whose mothers are teachers in the local school district, and all of them have been assured that it's legal for 6th graders to walk home by themselves and spend two hours alone until their parents get home.
Back on topic, can anyone confirm that you have to be 7 to sit on a bench alone? I know you have to be 7 to enter a queue alone or to ride alone. I've never thought to ask about just being in the park generally. I think it's most likely 7, but I've never asked.