Crandon is the beach Miami families default to, and the reason is a sandbar. A long bar sits offshore, parallel to the beach, and it breaks the Atlantic swell before it arrives. What reaches the sand is a shallow, warm, nearly flat lagoon that you can wade into for a very long way. If you have a four-year-old, that single piece of geology is worth more than any amenity.
The park runs about two miles down the northern third of Key Biscayne, and it is much larger than the beach strip suggests — 800-odd acres of it, including golf, tennis, a marina, mangrove, and the Bear Cut Preserve at the northern tip, where a fossilised black mangrove reef sits in the shallows. It is a rare formation and it is thousands of years old, and it is signposted with the enthusiasm of a bus timetable.
The land was a coconut plantation, the largest in the United States, owned by the Matheson family. In 1940 they gave roughly 808 acres of it to Dade County on the understanding that a causeway would be built to reach it, which is why the park is named for the county commissioner who made that promise and why the Rickenbacker Causeway opened in 1947.
Then the strange part. From 1948 to 1980 this beach park contained Miami's zoo. Crandon Park Zoo was where the city kept its tigers and elephants, until the combination of hurricane flooding and welfare complaints moved the collection inland to what became Zoo Miami. In 1991 the site reopened as a garden, and you can still walk between the surviving concrete cages with plants growing through them. There is a restored carousel and a small amusement area alongside.
One more layer: the Miami Open tennis tournament was played here for three decades until it moved to Hard Rock Stadium in 2019, which explains the stadium sitting in the middle of a park.