http://youtu.be/vqrnwjZ-sLM
It seems that DOC are really embracing social media and to that end they have just released another YouTube video promoting mountain biking, this time showcasing the Takapari Road track in the Ruahines, about 50 minutes north of Palmy.
This one takes it back a few years and offers zero singletrack but does offer a nice 17km climb to the border of the Ruahine Forest Park, past the A Frame hut. The top of the track puts you right 
at the top of the Ruahines and on a clear day offers views over both coasts and some amazing bush.
You can check out more about the Takapari Road track here on DOC’s website.
lots of good rides in this area, Totara reserve,Beehive creek,Branch road & for some steep try No 1 line.