From Indianola, IA take Route 92 east to Knoxville, IA then take route 14 north up to Lake Red Rock. Cross over the lake and take your first right and end at Cordova Park or Fifield Park.
This is the most amazing ride we have been on for a long time. I started in Cumming Iowa and ended at Lake Red Rock. Each mile is more beautiful than the one before it.You have little towns where you can stop if you wish.At the end you stop and see water, crashing waves on the rocks.If you do nothing else in your lifetime, take this drive!
The entire route is very nice. You will have hills, sharp curves and lots of country side scenic views.
You have little old town restaurants along the way. And, at the end, you can visit Elk Rock State Park in Knoxville (https://www.iowadnr.gov/Destinations/StateParksRecAreas/IowasStateParks/ParkDetails.aspx?ParkID=610155) or some smaller parks - Cordova Park or Fifield Park.