The Mad River Valley is the Green Mountains’ best-kept secret, shhh…. But since you already found out about it, we would love to share some of our favorite things to do in the Mad River Valley. Authenticity is the hallmark of the Mad River Valley. You’ll discover a place with a unique combination of scenic beauty, recreation, and community. “The Valley” exudes an ethos and sense of place that is truly palpable and gets its name from the Mad River, which runs through the heart of Vermont’s Green Mountains. It includes the towns of Waitsfield, Warren, Fayston and Moretown.