Now a year-round destination, Epic Discovery is Vail Mountain’s playground, with ziplining, summer tubing, a mountain coaster and miles of trails for hiking and biking. This wasn’t my summer vacation, but rather part of a Marriott Convention & Resort Network (CRN) press trip in Colorado. Over the three days, we saw meeting space, amenities and group offerings at the collection’s properties in the state—including the soon-to-open Gaylord Rockies Resort & Convention Center.