If your trip to Stuttgart is all organized but your itinerary is a bit on the empty side, we can give you a few hints and tips.Take in the best that this city has to offer by adding Schillerplatz and Old Castle to your itinerary. If you've got an extra day handy, swing by Schlossplatz and New Castle too.Stop by Porsche Arena. It's one sight you'll usually find on many visitors' to-do lists. If you still have space on that travel schedule, Milaneo and Konigstrasse will keep you on the go as well.