White Plains (start) > Anderson Hill Rd > Round Hill Rd > Bedford > Rt 121 > Rt 124 > North Salem > Purdys > Somers > New Castle > Pleasantville > Rt 9/Warburton > NYC (finish)
Requires MetroNorth train to White Plains to the start. Gorgeous ride through wooded countryside, past reservoirs. Lots of hills, but also lots of bailouts.
cw 4/22/15