TO DO-one last time

For the past few weeks I have been carrying around a small lined notebook so when I have that random thought on the train or out with friends I can write it down.  Really it is just a to do list of everything I need to do before I leave Chicago.  (Oh dates are set Aug 20/21 are my final days in Chicago).  But then the other day I was thinking I need to make a "one last time" list.  This list would be of all the things I need to do before I go, all the events I was to do, museums, tours, places, restaurants, etc.    I am finding that this is not a very long list.  Guess I kept myself pretty busy doing fun stuff all the years I have lived here.  So what should be on my list??  What would be on your list??  What must I do one last time in the windy city??