From Prescott, take Williamson Valley road 23 miles until it turns to dirt. Continue on Williamson Valley road 14 miles to the large metal bridge over Walnut Creek. Take the first left after the bridge and drive 2 miles to Walnut Creek Center for Education and Research. It will be on your left.
From Flagstaff (~100 miles), Take I40 West to Seligman. Exit South to Williamson Valley Rd, travel 30 miles and make right turn on Cr-125. Drive 2 miles to Walnut Creek Center for Education and Research, which will be on your left.