Durango Rivertrippers. This outfitter runs two- and four-hour trips down the Animas River. You can up your adrenaline output by swapping the raft for an inflatable kayak on any of the Animas River trips. Or ask about zipline and rafting packages, tube rentals, and ATV tours. 720 Main Ave., Durango, CO, 81301. 970/259–0289. www.durangorivertrippers.com.