It was really nice trip and highly recommended. It's not difficult to climb the mountain, but it's a good to bring proper hiking boots, a raincoat, warm clothes, and other hiking gear.
Also, It was windy and the weather was changeable, but it was a beautiful sunrise.
The espresso that my tour guide Konong made for me on the mountain was great.
The sulfur springs after descending the mountain helped to soothe my fatigue, Sipiso Piso Waterfall was impressive, and Lake Toba was calm; everything was just perfect.
I am really grateful to my guide Konong and driver Risky for having such a fun time.