This is not for the faint hearted, the trek is physically very demanding. There are more Mosquitos than all the deet of your dreams could deal with. The food is not great; tasteless and not nutritious, largely cabbage based so BRING SNACKs! But it is beautiful and you get to see a Thailand that is no more. I would never do it again, but it was spectacular. If you decide to do it then please, please remember food.