After going on a 5-day cruise on Royal Caribbean's Quantum of the Seas, I had a day to spare in Shanghai before heading back to New York.  Luckily, I had a great friend who is currently an expat in Shanghai to schlep me around for the day, and hit many of the hot tourist spots.  Not everyone is that lucky, so hopefully this post can help you plan if you ever plan on rolling through the city populated with over 24 million people.