From the village of Lempur, drive through rice paddies and cinnamon plantations up into the mountains until you reach the trailhead. Trek to a large hot springs, and then begin the climb up the volcano.
Hike up and down ridge trails, eventually heading into cloud forest close to the top. Be on the lookout for rattan vines and pitcher plants, and listen for the call of Siamang gibbons.
Camp by a small stream with nearby fumarole vents.
Wake in the morning and climb up to the summit. On the way, be on the lookout for the recently discovered flower, Impatiens kunyitensis. If the weather is clear, to the east you can see as far as the Indian ocean.
After you’re done enjoying the view, climb down into the crater using ropes as support in a few of the steeper spots, and explore the mystical “Taman Dewa.” Make camp there.