The main activity at Lake Toba is exploring Samosir Island. At Ambarita, three sets of stone chairs dating back some 300 years served as both a council chamber and execution site for Batak kings — the guide explanations are matter-of-fact and vivid. The Museum Huta Bolon at Simanindo occupies a traditional Batak compound and hosts dance performances; it is the most accessible introduction to Batak culture on the island. The grave of King Sidabutur in Tomok draws steady visitor traffic. Hot springs at Air Panas, about 40 km from Tuk Tuk, are warm rather than scalding and good for a soak. Swimming in the lake is popular, the water cool and clear. In July the Lake Toba Festival brings dragon boat races and traditional dancing to the shoreline.