If you’re ever see the narrow road up a mountain just inland from Khanom that goes up Dat Fa Mountain, from sea level to 750 meters area, and wonder “What’s up that interesting looking narrow road?” It’s not worth going to the top. But the views in the first 2kms are really something, and there is a kind of lookout where you can park off the road.
For more info you can read this blog.
http://paulsr.net/post/tag/thailand-2