From Rt. 2 take the Walden Street exit, heading north to Concord. Bear left at fork onto Thoreau Street, and make first right onto Laurel Street. The School is on your right.
The 55 mile route includes a climb up to the Haystack Observatory in Groton then returns via Lost Lake Rd in Groton. The 45 eliminates haystack and Lost Lake and continues through Forge Village. The 21 goes through Great Brook Farm and returns from there. If you need a cue sheet please print one from the links above.