My parents, me and my two kids ( 6 and 9) plan to visit Chicago for 3days during Jun 30 to July 3. We already booked one suite in Embassy Suites Chicago Lakefront. We plan to go Navy pier, Museum Campus, millenium mile and Michigan Ave. Now there is a deal on Groupon, 3 days CTA pass is only $9 per person. So my question is: which one is better , taking taxi in downtown area, or buying 4 of 3 days CTA pass for my family and taking bus and train in downtown? Will taxi be much more expensive than taking bus and train? Thank you for your reply!