From the University of Scranton:

Stay straight on Mulberry St until you get back on the Central Scranton Exwy
Take the Central Scranton Exwy to the Exit for Rt. 307/Keyser Ave.
At the bottom of the ramp there will be a light.  Make a Left.
Go thru 4 lights and continue straight (total Approx. 3mi) and you will see a sign for
     Lakawanna County
     Coal Mine Tour
     McDade Park

Make a right when at the sign.  Continue on the road until the entrance to the Park, which will be on your right.  Go down the road until  you see signs for the baseball fields.  You should be able to see the goal posts from the road.  When you get to the sign for the baseball fields, make a left.  Follow that up to the parking lot.  The pitch is on the left.