I Don't Know How She Does It by Allison Pearson

This looks like your typical chic-lit book, but I would suggest that it isn't. First of all, the font size is way smaller than the average chic-lit book. Second of all, there is some depth to the character and her development.

This is the tale of Kate Reddy, hedge fund manager, wife, and mother of two young kids. Her life is crazy, hectic, guilt-ridden, and exhausting. She succeeds at work, but her kids miss her like crazy and her marriage is failing.

A funny, engrossing look into the life of a working mother. The character struggles with who she is and what she wants. This book is worth reading and would be a fun book to read while on vacation.