One more comment.
When you visit a park’s website, there might be a separate page for each place inside the park. Add such deep links when creating a new place. This will greatly help Google verify the place’s existence, and your approval rate will increase.
To learn more about getting new places approved, let me mention this post:
https://www.localguidesconnect.com/t/how-to-get-edits-and-new-places-approved/374518