There is RISK in following these addresses in GPS, so I recommend following directions below. People often end up in neighborhoods when following the GPS address. Check it, but check to see that the destination is a massive high school on a mountaintop and not a neighborhood/development.

Google Maps Address: 279 Timberwolf Drive, Lehman Township, PA
iPhone Maps Address: 279 Timberwolf Drive, Bushkill, PA

Get on I-78 E/PA-309 S in Salisbury Township from PA-29 N/S Cedar Crest Blvd - 7 min (3.2 mi)
Follow I-78 E and PA-33 N to US-209 N in Hamilton Township - 38 min (40.5 mi)
Keep right to stay on US-209 N, follow signs for I-80 E/Stroudsburg - 4 min (4.2 mi)
Continue on I-80 E to Smithfield Township. Take exit 309 from I-80 E into Marshall's Creek. - 5 min (4.2 mi)
Follow US-209 N to the end & make a right onto 209 North.
Continue on Rt. 209 until you pass Fernwood Resort/Villas (light).
1 mile past the resort, make a left onto Bushkill Falls Rd. (at the light). Following signs for Bushkill Falls.
School is approximately 6 miles on your left (you will pass Bushkill Falls entrance about halfway there).