A slight correction, or improvement, to Kevin's directions...this seems a bit easier in the long run to me, but whichever way will work.
When you get onto I 435 southbound, go to I 70 WESTBOUND.
That's right near the Kansas Speedway.
Take 70 West until Highway 7 exit (I think it's the 2nd exit after you get onto 70...) Take 7 South to Santa Fe, it's roughly 12 miles. Right (West) on Santa Fe to the next light, Olathe View Road. Right (north) on Olathe View to the park on your left...keep left inside the park to #1.
You can also get a map on the PDGA course directory or from the "Courses" link on the first page of the KDFDC page.