Talking about a hellish trail. I went for a ride on Sunday with Alex USA and our Thai friends, we did a 10km trail up and down a mountain in the Sankampeang area which was basically a boulder field... Only recommended for masochist people haha... I think Derren would have loved it though. Don't think it's worth putting it on the north Thailand map as it's barely doable walking.
[attachment=0:3td3m0a7]boulders.jpg[/attachment:3td3m0a7]