A: The best place to park and access the Alpha Trail is off 92nd St in a parking lot for a public golf course. From the parking lot, you cross 92nd St and are at the top of a hill. Towards the bottom of the hill, there is a trail off to the right and that is part of the Alpha Loop. The Alpha Loop used to include more trails, but a complex called The Rock was built as a downhill mountain bike park (accessed off 76th St and Crystal Ridge Rd) which took some of the trails away. However, just last week they announced they will no longer operate the downhill bike park and they opened up those trails for XC use, but require a $5 day pass that you pay at a station within their parking lot (I have not been yet, so I cannot direct). If you are strictly staying on the Alpha Loop, it is free (follow Alpha loop signs near the former bike park). Also, there is a Wednesday night series of racing that takes place there (I think around 6pm), so watch out for that. If you are willing to drive a bit further, Emma Carlin and Camrock also have technical trails.