Awesome race for my first full marathon and a wonderful cause. This is an extremely well supported race by the people of Oklahoma City and everyone involved deserves high praise. The course is not terribly difficult, the loop at the lake late in the race is a little difficult because there isn't much support out there, but that's due to a lack of areas for spectators to stand. The course is sneaky hilly in the second half but the elevation changes help make the course more interesting.