Take the 75/85 connector to I-20 East. Go south at on Moreland (the first Moreland exit). Turn left at the second traffic signal, onto Glenwood. Turn right at the first traffic signal onto Flat Shoals. At some point, Flat Shoals veers off to the left. Do not veer, but instead continue straight onto Bouldercrest (you may not even notice this). Turn left onto Mary Dell Drive, which is approximately 1.5 miles from the Glenwood/Flat Shoals intersection. The field is behind the school, up the hill.
ALTERNATIVE: Take a left off the Flat Shoals exit off I-20 (back over I-20). Take the first right onto Fayetteville Rd SE then the 2nd right onto Mary Dell. School is on the right.