It appears as they two people have either been buried in sand or someone made sand people.

Also, if this really is Dinner Key, these folks are very close to the set of the USA Network show Burn Notice, in the old Coconut Grove Convention Center. It is also on the far left of the Pan Am seaplane photo in the comments.

Why isn't everybody's shadow falling in the same direction?

[Because the sun is directly behind the camera, the effect heightened by the relatively wide-angle lens, as shown in the example below from this page. - tterrace]

Looking out at those sailboats Winslow Homer would feel like painting.

I always like seeing that in some areas, some venues, blacks and whites could sit in equal, unseparate enjoyment.

This would be Dinner Key in the historic section of Miami known as Cocoanut Grove (later spelled "Coconut"). Other than a small beach downtown, Dinner Key was the only sandy beach along the bay front and a popular picnic spot, hence the name. The natural stone escarpment is the tail end of the Silver Bluff.

In the distance, from the left are Miami Beach (then called Ocean Beach) and the islands of Virginia Key and Key Biscayne.

In later years, this area was filled in and became a seaplane base and home of Pan American Airways. The old PAA Terminal is today's Miami City Hall.

Rock fans will remember Dinner Key as the location of an infamous 1969 Doors concert which led to the arrest of Jim Morrison.

Lots going on here!

There's a Photographer taking a picture, a couple bent over looking at something and it appears those kids in the foreground sent their Chauffeur out to build them a sand castle.

Exposed! You can hide behind the camera but you can't hide behind your own shadow. Man with a view camera taking a picture of a man with a view camera taking a picture. Interesting.