The Cape Cod Rail Trail is a 26-mile paved cycling and walking path that runs from South Dennis to Wellfleet, passing through Harwich along the way. The surface is smooth, the grade is flat (it follows an old railway bed), and the route winds through pine and oak forest, past kettle ponds, and alongside cranberry bogs that blaze red in autumn.
Harwich has several access points, including a well-used trailhead off Route 124. Bike rentals are available in Harwichport and along the trail. The section through Nickerson State Park in Brewster is particularly scenic. The trail is busy on summer weekends — early morning cycling gives you the woodland stretches largely to yourself.