Go see Lincoln Park Zoo, it's a great place to visit and spend the day. The Zoo is free but parking is a little pricy and street parking is impossible. General hours are from 9am-6pm. Lincoln Park Zoo is pretty large and extremely educational. I think it's one of Chicago's greatest places to spend a Sunday afternoon . They also have paddle boats which is always fun. The neighborhood is like one big park full of families, joggers, and Sunday bike riders. It's minutes from the Lake Michigan.