A good option if you've not got the ticket is to push up the Raven's Walk. It'll get you up to the top road by the tunnel easily, and the very top if you're prepared to ride up a bit of tarmac. Ride/push up to the road drop, go left (when looking uphill) along the road for a 100m or so till you see a path leading steeply up to the right, ride/push up this (in places it is a little gullied with some steps). Keep heading up till you reach the road. Here you can either turn right and pedal along the road for 1/2km perhaps, till you see the DH course passing beneath the road. Or you can head straight on up the steepest road (past the very short sharp concreted climb on the XC course), follow the road up until you reach the wooden man with his rather knackered bike, turn right up the forestry road and you're at the very top of the course. It's possible to do the push in about 20mins if I remember correctly (I usually just ride up and along the XC till the steep concrete climb and head off to the DH from there – a nice option really if you like the rest of the XC course).
Bit sad to see they'd flattened the techy bits on the climb, and the removal of the wood work at the top still brings a tear to the eye.
Neil