Alien Run consists of three looped mountain bike trails that cover over 15 miles. The area contains a rumored UFO crash site. The short and long loops are intermediate, and the Outer Limits Trail is more technical.

From Aztec, NM, travel northeast on highway NM 550. From the junction of NM 173 and NM 550, travel northeast about 2.9 miles to County Road 2770. On County Road 2770, turn east and travel about 2.7 miles to an oil and gas road. Turn north on the oil and gas road, and travel about 0.5 miles to the top of a hill, cross the cattleguard, and turn east on a narrow road to the parking lot.