From Northampton:

Head West on MA-66W/Westhampton Road.
Slight right onto Old Town Road, Slight right onto Searle Road.
After the mail boxes, look for a sign to Timothy Hill Christian Camp and turn right by the large farmhouse.
Follow the signs to THCC, keeping right at every fork.

Or you can simply plug in the address to your GPS
128 Norwich Lake, Huntington, MA USA 01050