The Heights has several nice parks and Milroy Park is no exception.
The park has a large play structure with lots of slides, places to climb, and monkey bars. There are also spring riders, swings, and a tire swing in the same area.
I wasn’t too worried about them playing in this hidden area because the park is fully fenced and they couldn’t get very far. I would advise checking it out before allowing the kids to go back there though, just in case there are ants or other things that may cause a problem.