An island on a Caldera lake created by possibly the most significant geothermal event in human history, this is a place to relax in one of the lake facing cottages, swim in the warm freshwater, and enjoy the fresh delicious food. It’s easy to get stuck here but if the lazing gets too much, hire a motorbike and head out to explore. There is a viewpoint about 1.5 hour drive away and hotsprings. The hotsprings were a disappointment, as hotsprings in Asia generally tend to be. I wasn't too fussed about the viewpoint either. Stay on Tuk Tuk, relax and enjoy the Batak hospitality. There is a tiny lovely library, and did I mention the magic mushrooms.