Great hike. First step is to pay reception guy at Green Lodge. He will point you in the right direction. The first part of the hike is fairly civilized and then dives into the jungle for a potentially muddy jaunt up. Veer to the left anytime you see barbed wire and you should be able to just go around. Walk down to the crater is as treacherous as advertised. We found that using a walking stick as a third point of support helped a ton. Lagoon is gorgeous. You'll be exhausted when you get back but you won't regret it. Just make sure the forecast is dry and you have good shoes. Never boring, never monotonous. Loved this hike.