Animas Mountain is on the north end of town and is a great hiking and biking trail within the city limits. It is BLM land and has trails designated for bikes and hikers. The biking trail is a 6 miles loop with close to 2,000 feet climbing. It is pretty rocky but has some tremendous views of Downtown Durango and the Animas Valley to the north. Once you reach the top, you are rewarded with close to 20 minutes of down hill.