Just happened to notice this slip into today's update. The space is not very big but it's a nice scenic spot. You can see parts of the public space from behind the spawn point and there's a nice gazebo area and a small beach, as well as a little island accessible by bridge. I received 6 rewards upon entering the space, listed below:
I'd be on board with this if it had direct access to Acorn Park, or if friends in the park could just walk into the space while the owner is there.
Cool rewards, but overall I don't see a point to it since I already own the Midnight Glade.