From Lancaster take RTE 283 toward Harrisburg.  Take the Hummelstown Exit onto Vine Street which will turn into Middletown Road and then Hanover Street.  Hanover Street will then become Grandview Drive as you go through Hummelstown.  Continue thru one lane underpass and over bridge. Turn left immediately at Hoernerstown Road. Proceed .75 miles to Stone Mill Road. Turn left and enter Keller Field Complex.
From Pa Turnpike: Take Exit 247 (old exit 19), go to 283 North ( To Harrisburg) Take 322 East to Hershey Go about 7 miles until you get to Hummelstown/Middletown exit. Take exit and bear left towards Hummelstown. Continue thru 2 traffic lights (crossing Main St and Second st), go thru one-lane underpass and over bridge. At the end of bridge turn left onto Hoernerstown Road. Continue on Hoernerstown until the second left which is Stone Mill Road. Turn left you will see a sign Keller Field. Keller field is 100 yards on your left.