Returning to the air again for a different view of the resort town and amusement park at Arnolds Park, Iowa, we see a smaller lake in the foreground, the isthmus of land beyond it where Arnolds Park is situated, and then the larger lake across the background of the photo.

Careful inspection of the image shows a notation on the near shoreline labelled “Oak Hill”. It is not clear what this signifies but it is in close proximity to a boat launch and pier, so it may be another public establishment.
This picture is clearly labeled as being from 1942.