Iowa game is our favorite road trip. We usually stay in CR and have done the Amana area once. We park at Finkbine GC which is us an easy 20-30 minute walk east to Kinnick. For some reason it was closed in 2019. Fans along the way are always entertaining and, unlike Madison, the Iowa fans have been cordial. But we haven't won there since when, ..... 1999?
The train to Kinnick is another option but get on board early. Never done it but will someday.
Watch your speed on 380 in CR as they use camera's and other tech to catch speeders. Thirty days later you will get a speeding ticket in the mail. We like to stop at the Cedar Ridge Distillary just south of CR. Good bourbon and they have some food.