Milton High School is located at 86 School Drive, Alpharetta, Georgia 30004. That's right off Canton St. (which becomes Roswell St. to the south) and just north of Milton Ave.
Their cross country meets are generally held at one of two nearby parks in Alpharetta:
Webb Bridge Park at 4780 Webb Bridge Road in Alpharetta is where our four-way meet with Milton on Sept. 25 is scheduled. (Its street address appears in most online map databases like Mapquest.)
Wills Park (which hosts the Cheese Grater Invitational) is located on Wills Road and Old Milton Parkway in Alpharetta.
Unless you are adventuresome enough to follow Coach Yelton's directions, your best bet from Woodstock might be to take Highway 92 over to Georgia 400 at Roswell, then 400 north to Alpharetta. Neither the parks nor the high school are too far from Georgia 400.
Here are a couple of maps directly to Webb Bridge Park:
Here are a couple of maps directly to Wills Park:
And here are some maps to give you a general idea of the high school's location: