Here is a video featuring the 22-mile Cape Cod Rail Trail. It begins in Dennis and goes all the way to Wellfleet, though it is being expanded now and will start in Yarmouth once the new trail head opens early in 2018.
The three books of the In My Footsteps series are available at Amazon.com.
In My Footsteps: A Cape Cod Travel Guide
In My Footsteps: A Traveler's Guide to Martha's Vineyard
In My Footsteps: A Traveler's Guide to Nantucket