Schuylkill Expressway to 202 South.
Take 202 South to the Route 30 exit.
Go west on Route 30. The road will divide between Business Route 30 and the Route 30 Bypass. Take the Business Route 30 (Lancaster Avenue) going west into Downingtown.
On Lancaster Avenue, go exactly 7.0 miles. You will cross over Route 100 and Route 322. Be sure to NOT follow the signs for Route 30, continue straight on Business Route 30 (a.k.a. Lancaster Avenue).
On Lancaster Avenue you will pass a McDonalds (on right) and come up to a Rita's Water Ice (on the left). Take this left onto Viaduct Avenue.
On Viaduct Avenue, you will quickly come to a bridge which you will drive under. Just past the bridge is Johnsontown Park.