Beans says that the ceiling on the porch was painted a "watery blue-green that looked like the sky" and that most of the porches in Key West were that color. It was called "haint blue" and was supposed to keep ghosts away. It's still true today.
Wreckers were people who saved the cargo from a sinking or stranded ship and then kept or sold what they found. In Key West there is a Shipwreck Museum.
Here's that picture of the turtle kraals again. Splash!