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Senaru ascent route
This is by far the most used route as it allows the (relatively) less strenuous trek to the crater rim only. You start at an elevation of 600 m in Senaru village, normally in the late morning or early afternoon and make the 6 hour ascent to the crater rim before dark. First part of the trek is through tropical rainforest. Look and listen out for the lutung, or black monkey, swinging through the trees in the late morning. They are extremely shy, unlike for the common macaques which may gather near rest stops waiting for scraps. The route passes through POSII at 1,500 m, breaches the treeline at 2,000 m (POSIII) and then it is a bit of slog up gravel paths to the camp site just below the crater rim at 2,600 m. There is no clear path at the last section nearing crater rim, at an incline of 45 degrees. There is a POS Extra after POS 3, but it is pretty much gone, and the remaining bits have been chopped up by porters as firewood.
If that has not sapped all of your energy you can then make a very precarious descent down to shores of the crater lake and bath in the hot waters. You need some confidence to do this as it is a steep descent of 600+ m using handrails and ropes. And then it is back to Senaru the way you came. Local guides claim going down is faster, but speed varies for individuals. Patience is vital for first timers, as it can get frustrating watching porters sail past you with their load balanced on one shoulder, clad in slippers or even walking barefoot. Descent from POS Extra to POS 3 can be slippery when weather is dry, as scree tends to give way under your feet. From POS 3 to POS 2, the descent can take 1.5 to 2 hours, as savannah grasslands fades away, and the humidity and heat from the tropical rainforest begins to set in. Useful tip: request for guides to cut out a wooden trekking pole if you did not bring a trekking pole with you. It will be extremely handy during the descent, especially when legs are aching from the strenuous climb. There is an option to go on to Plawangan II where you overnight again before making the ascent to the absolute summit. This is not especially recommended from the Senaru side though. If you want to get to the top, the climb to Plawangan II is best made from Sembalun.
Sembalun ascent route
Starting in the morning from the Rinjani Trek Centre in the village, the climb to Plawangan II at 2,638 m will take about 8 hr via POSI (1,300 m), POSII (1,500 m) and POSIII (1,800 m). Starting altitude is 1100 m, so there are no humid conditions to deal with. First half or more of the trek is literally a breeze. The trek through savannah grassland is windy and easygoing, with gentle ups and downs, and the only obstacle to look out for are the cow pats deposited by the villagers cows along the way. Rolling hills and amazing scenery help to ease the tiredness, unlike the enclosed tropical rainforest of Senaru route.
From POS 2 to POS 3, the climb is still manageable. The challenge for Sembalun route is from POS 3 to POS Extra, as the uphill gradient can be 50 degrees at times. Young children will find this section challenging as some steps are set quite far apart. Cooler weather up here may give the impression that the body does not need fluids, but do drink more to prevent altitude sickness setting in. Strangely, there is a guy selling cold drinks for those who crave it. Overnight at the campsite here and go for the summit starting at 3 AM the next day. You need to be well rested as this is a stiff task, the final climb is nearly 1,100 m on difficult ground