This is the January 1971 issue of National Geographic magazine. It contains an article on the Lower Keys at the southern end of Florida.
The author defines the Lower Keys as all the islands that are located south and west of Key Largo, which he described as “too close to the mainland”. The term Lower Keys is typically used in the Keys themselves to describe roughly one-third of the islands from the Seven Mile Bridge to Key West.
The article is an overview about life in the Keys. There are several mentions of tourist attractions, though to be honest, the entire string of islands that make up the Keys could be legitimately considered one giant attraction. They are unique in so many ways and many of the islands are quite distinct from each other.
Attractions covered in the article include John Pennekamp Coral Reef State Park, Santini’s Porpoise Training School, the National Key Deer Refuge, the house museums for John Audubon & Ernest Hemingway and lying (arguably) just outside the Keys: Fort Jefferson in the Dry Tortugas National Park.