My girlfriend and I did the 2 nights/3 days hike. Very important to have warm clothes. At camp 1 and 2, it is cold and the wind is strong. It is absolutely necessary to be in long pants, with a windproof coat and ideally a toque. Wake up around 2-3 am to climb the summit of Mount Rinjani. The climb takes about 4 hours and the last hour is extremely difficult, even for very fit and experienced people. It is usually at this time that many unfortunately give up. We arrive at the top for sunrise and we can take the famous photo with the sign. Then, we descend for 2-3 hours to camp 1 for lunch. After lunch, we leave for the day. We descend for about 2-3 hours in the middle of the mountains, around the lake, to the hot spring. A short swim, dinner and we leave for a 3h-4h climb to camp 2 in time for dinner. The next day, we go back down for about 6-7 hours and that's the end. the company that we went with on this trip was Rinjani Sunrise. Ucok, the manager arranged our transfer to Senaru, they picked us up as soon as we arrived in Lombok the day before the trek and took us to the place where he was waiting for us, smiling, with a welcome tea. Short briefing of the trek, double check our prepartion, and bring us to our accommodation. After the trek, they transfer us to our next destination (for us it was in Kuta, at the other end of the island).