Going to Chicago.. what to do?!?!

Alright Chicagoans! I am coming to your city at the end of september to party and see the sights. I am bringing along my fave forumers with me, Dallas Texan and CityGod5. Our main objective is to party, but since I have never been to this city, nor seen a skyscraper close up, I really want to take it all in. So what should I do? Where should I go? I want to see the razzle dazzle of the city, and I want to see the grit. Please let me know, I dont want to miss a thing. I think we are planning on having dinner on the 96th floor of the Hancock building (yikes!). And if any of you forumers want to join in on the party, let me know!! I am very excited about this trip!!!!!>