I did the Flint Hills 50 this weekend in Manhattan Kansas. There were many hills, as advertised. The race was 2 loops and there was a little more than 2000 feet on each loop. The race was on dirt and gravel roads. it's a very small race. They had one of the biggest turnouts this year with 50 people running the 50 miler. They also have a marathon. Only 2 people DNF'd. It was a fast race, but I believe that's because most of the runners were local and trained on those hills. I, unfortunately, don't have anything like that around where I live in DFW. It's a good little race, though, if you want to get some big rolling hills in.