This bike path is a rail trail from Ayer Mass. to Nashua N.H., 11 miles. While I used to inline skate, I known find double and single tracks off the asphalt. All tracks are green with no major difficulties.
Beginning from Pepperell Ctr. Go north. Once out of town, there are a number of double and single tracks available off to the left.. There are fun rollers on a track by the Nashua River.
Going south from the Ctr. are double and single tracks off to the right. Here roots are more abundant.
These tracks are all very easy with no major obstacles. There are some streams you may need to cross. The south routes are horse trails too.