Darwin. Blue-footed Booby. . . Some things just “say” Galapagos. Darwin. The blue-footed booby. Marine iguana. Darwin’s finches. And, of course, the eponymous tortoise. I’d heard the words before, but now I was about to see them. Here I was, shoe-horned into a small plane approaching Isla Isabela, the outermost inhabited island on the Galapagos…