Sonny McCoy Indigenous Park is a rare pocket of native greenery in Key West. The small park has native trees, a freshwater pond, a wildlife trail, and the Key West Wildlife Center, which cares for injured local animals.
It is not a substitute for the Keys' bigger nature reserves, but it is a worthwhile low-key stop if you are staying in town without a car. Go for birds, shade, and a reminder that Key West's natural life is not only offshore.