Give a kid aged around 8 to 11 an old fashioned paper map of the state showing every secondary road. Draw a dot on Somerville and a dot on Amherst. Tell him or her to create a route that goes north of Quabbin Reservoir and avoids cities outside the Boston area and avoids interstates and highways and avoids routes 2, 3, 9, 20, and 30 as much as possible. Then let the kid be your navigator. If you don't have a kid, find an adult who can pretend to be a kid. Enjoy!