Route advise from Wisconsin Dells to Indiana Dunes SP

There is no easy way that is toll free. The I90 to I39 to I80 is the route you want least number of tolls. I believe 3 total $10-12 for 4 axles day time cash rate. I remember when the tolls were 30 cents and the toll road was going to be paid off years ago. You'll want to pickup I94 once in Indiana.