Snowmobile Adventures. With access to more than 75 miles of trails traversing mountain passes, old stagecoach roads, and mining sites, Snowmobile Adventures leads one- to four-hour tours from base area of Purgatory at Durango Mountain Resort. Rides are available daily during ski season between 9 and 5. Village Center, Durango, CO, 81301. 970/385–2141. www.durangomountainresort.com.