I would have to say
Pioneer Trail at Rodeo Park in Ft Madison, Iowa. Definitely the most grueling I've played, The longs are LONG, and when you are in the woods, you are throwing up and down STEEP long hills blind! ...or you are throwing along a winding creek bed. I do want to go back and play it again, but I was very frustrated by the time we left that course. There is actually a rope tied to a tree to help you climb the hill! In hindsight, It was a cool course. It just needs some improvements to make it a Great Course. Starting with better Maps at the Teebox!