A Day Trip to Chicago

What do you do with only one day in Chicago? My family recently went there for a biannual reunion that I explained in a similar post a few years ago. Since then, the families have grown by one husband (mine) and five stepchildren (although only the youngest goes to the reunions). With only one full day that all six families would be in town, we decided to start with a trip to the Field Museum. Our party of 21 people hiked about a mile to the train station and rode an hour into the city. It's a personal post today at mental_floss.