The Green Circuit - This is an ideal introduction into the feel of Mountain Biking. This circuit offers a gentle ride in the woods that can perhaps progress to be a warm-up session for the more challenging routes.
If you are looking for "easy, beginner", a bit rubbish might translate to "ideal for you".
drive to the upper car park and start from there, ideal if someone will drive the car down for you so you can go all the way to the bottom car park.