Go up falls creek Rd for 5kms until cranky charlie (big right hand corner cut around ridge then turn right around on yourself and go up the dirt road. Keep following this until it starts heading downhill where you veer left up the hill. After a little while there will be a 4wd track on the left. Up that about 100m is where all the DH short course tracks are.
The track starting with the drop across the road is an old nationals course and also the end of the big hill course, its not too tech but really fun and flowy.
Keep riding down the fire road on the ridge and turn left onto singletrack and you're on the current short course track, this track is pretty rutted, rocky and steep. Perfectly doable on anything but just take your time. Careful of the chute at the end if you're on a hardtail.
If you dont take the 4wd track to the top of the short course you can continue up the road for a long while until you reach a platform basically and a gate. Ride around the gate and continue along the road until you see Big hill dh track drop off to the left. This is doable for anyone also, long fun and fast.
There are a few other minor trails you can ride off the short course hill. It's basically a case of all roads lead to Rome.