I used to love to read on vacations, but somehow, there is never any time to do this anymore.
One of the books that I read, that I liked, but I loved the movie was The Nanny Diaries. The movie just really fleshed out the overbearing mother so much more, and I would also say the same for The Devil Wears Prada. It is much more satisfying to see the partial redemption of a character that you have grown to hate on screen than in a book.
One movie that was the opposite in the same genre would be The Confessions of the Shopaholic, the book felt more like a complete story while the movie really centered entirely around Sophie's character. Don't get me wrong she is the main character, but the other characters in the movie felt like they were there only to showcase her, in the book you got to know and care about all of the characters.