Lets Plan - Six Flags Great America via Public Transportation

Crazy Quick Trip? 

Summary:

I'm taking Amtrak up but once I'm already downtown can I leave after work and make it to Six Flags for dinner and some rides? This way I can still work a bit on the train and don't have to worry about traffic. Plus, I don't usually have my car with me in Chicago.

There:

Looks like if your near Union Station down town Chicago you can use google maps to find the route. For this test I would take Train UP-N, Ogilvie Transportation Center to Waukegan, 4:00 - 5:07 PM then Bus 565, Sheridan Rd & Washington St to Grand Ave & Lawson Blvd/Six Flags Pkwy, 5:17 - 5:39 PM 

Back:

To get me back around 10:30 I would need to catch Bus565, Grand Ave & Six Flags Pkwy/Lawson Blvd to Waukegan Metra Station, 8:39 PM - 9:01 PM then Train UP-N, Waukegan to Ogilvie Transportation Center, 9:05 PM - 10:23 PM

I downloaded the Ventra app and it looks like I can use the phone to get on/off everything.