#1) Why does she feel that the only thing Manhattan and Antigua share is a geographical definition of being islands?
Answer: The reason why she feels that the only thing Manhattan and Antigua share is a geographical definition of being islands is because the people that live in it and their daily lifestyle is completely different from where she used to live. She makes this apparent after describing the morning routines of the people, like waking up at half past five, at six o'clock and half past seven.
I hope it helps, Regards.