The Official "I'm visiting/moving to Chicago, what should I do?" Thread

Here's something I thought of, since so many people make threads like "I'm visting Chicago this summer, what are some must-see things?" or "What aree some things to do here?"Maybe we could make a sticky devoted to just that. A thread where we can post links, pictures, and suggestions of things to do and/or see in Chicago. Does anyone think it's a good idea?>