$7 one way?! I guess Chicago's spoiled me at $2.25.
Day trips are more interesting because of the South Shore Line.
http://www.mysouthshoreline.com/tickets/maps-stations
It's a electric rail that runs from South Bend, IN to Millennium Station in Chicago. Take something like a Cubs game. I drive 2 hours to the Dune Park station
https://www.google.com/maps/dir/Marshall,+Michigan+49068/Dun...
From there I park for free and ride the train to Chicago and then hop the Red Line to Wrigley. Even if it's a night game I can still make it back to Millennium Station for the last train out at 12:45AM.
The South Shore Line is also great for conventions on the weekend because it stops right at McCormick Place.