You can post your answers in the comments. If no one guesses, we'll post the correct answer in a few days.
Update: Here is a related photo that might give you a little hint (or it might not).
Answer: These scenes show what it looked like before and during the construction of the Cedar Point Causeway in 1956. The first image shows the view from First Street looking into the clearing being cut in the woods for the road. The second image is at Venetian Drive and First Street, with the bay in the background. The third image shows the roadway being built, circa April 1956. (The Library owns a set of more than 200 photographs showing various stages of the construction of the causeway.)This image showed how it looked in 1953, before construction began. Prior to the completion of the causeway, the only access to Cedar Point was via the chaussee or by boat.