From Pittsburgh:
Take I-79 south get off at the Southpointe Exit.
Take a left at the bottom of the off ramp onto Southpointe Blvd.
Follow that for half a mile until it ends and take a left onto Morganza Rd
Follow Morganza Rd for a half mile until you come to the bottom of a hill and make a right at the Junk Yard.  You are now on Georgetown Rd.
Follow Georgetown Rd for a half mile then it makes a hard left up the hill and keep going on Georgetown Rd.
Another mile or so and Georgetown Rd makes a hard right. 
Go another half mile on Georgetown and make a left on Mayview Rd. 
The Elementary School is on your right.  The field is behind the school.