A river runs through it, and there are mountain ranges on either side. But that’s only part of what makes the Mad River Valley so scenic. The farms and settlements are charming, too. The best way to see it all is from two wheels. A 16.3 mile loop takes you off the main thoroughfare — Route 100 — onto the back roads of Waitsfield, Warren and Fayston, through covered bridges and along ski slopes, past art galleries and antique shops.