A few stilt houses have survived hurricanes and are allowed to remain in this huge marine park just outside Miami. The lighthouse in the background was once part of the Underground Railroad, as boats would risk the reefs to come here at night to pick up escaped slaves and fleeing Native Americans to live in the Bahamas, which ended slavery in 1834. While the Key Biscayne in the background above is a barrier island, the Florida Keys are part of an ancient reef that begins here, includes Key West and runs to the Dry Tortugas.

The best way to see the park is by boat. I took a very small tour from Coconut Grove out to the flats, to snorkel on both ocean and bay sides of Elliot Key, and had lunch on Boca Chica. The reef I remember from the 1980s has been devastated by carbon pollution from fossil fuels—elkhorn & staghorn corals are functionally extinct here now—with widespread coral bleaching and only a fraction of the marine life. But it still has life. I counted dozens of species including a beautiful French angelfish, various colorful parrotfish, spiny urchin and a lobster. From the surface we saw mating loggerheads, a manatee, and many birds, but the vast majority of wildlife is just below the surface. Let me show you what I mean.