https://i.imgur.com/PlWhWLL.png

Oh yeah this one was interesting, I was out at the park 2 weeks ago and saw a NYC Parks sign at the purple X labeled Kissena Corridor Park and then after passing the underpass at the blue X another sign labeled Cunningham Park.  

So I think Francis Lewis Boulevard is the divider, and I think Kissena Corridor park is the red bordered area, although I'm unsure about the forested area above so I avoided changing that and just added what I had confirmed (the area between 73rd and Union)

I'll be back in the park next month when it's a bit warmer and can take a picture of both signs near the underpass to confirm.