This image shows a much more sturdy looking and better maintained dock than the previous image. Also, this one is much more popular among the California Gull population. A quick review of the population shown indicates these are all adult males.
There is a net drying frame in the left rear of the picture, so this is likely also a fishing dock.
The caption states:
Sea Gulls Northport, Mich. 52
This picture likely dates from the 1930s.

This image is an interesting look into the mid-20th century way of living and fishing. This image is one that might have been familiar to the writer John Steinbeck as he composed his book Cannery Row.
The racks on the right are loaded with fishing nets left out to dry in the sun. They are built on pivots that allow the nets to be rolled on and off as required. The two children are both too young for school, and may in fact live in the building at the end of the dock. The container in front of them appears to be full of floats for the nets. It is not clear what the rails are used for, but it is possible it is for off-loading the catch and moving it more easily.
The caption states:
A Scene at the Fishing Docks – Northport Mich. -61-
This card likely dates from the 1930s.

These lakefront gardens existed during the WW 2 era and likely before and after, but there is no indication that they survive today.

The caption states:
Drydens Beach Gardens Northport Point Mich. P6
Other cards showing this same scene are postmarked in the 1940s, but it is likely the images date from before that time, as such pictures were used continuously for many years.
This card was used, and is postmarked 1943, but like the others it is most likely that this image dates from the 1930s
 

This series of cards are from the earlier days of postcards, where photographs were printed on heavier stock and stamped on the back with a generic Post Card imprint, showing where to write the address and personal note.
The next few cards show a remote area of northern Michigan’s lower peninsula called Northport Point. The area is at the extreme north end of the Leelanau Peninsula so it is usually visited deliberately and not on the way somewhere else.

The caption states:
Sandy Beach & Drive at Northport Point – com b
The last few letters in the caption are probably sequence numbers for the postcard collection.
This postcard was used, and is postmarked June 1939.