I did Fairfield to Keokuk. I've never spent much time in that corner of the state and was blown away. The small towns were well maintained, and I loved the town squares and quarried limestone buildings. Almost all of the towns (Donnelson and Salem especially) really gave it 100%.
Southern Iowa feels like a completely different world than northern Iowa. Everything is older, and very pastoral. Instead of the wind swept empty Great Plains, you have rolling hills with forests, and a general slower pace of life. Everyone was friendly, welcoming, and just awesome. West Point in particular was a highlight. 5 bars, and the bartender at Aggie's was a smoke show.
Nothing highlights why Iowa is an amazing place better than RAGBRAI. I love this state, its people, and the fact that so many folks are willing to drop life for a week in the middle of summer, hop on a bike, and embrace it.