We took a 24 hour detour to Berastagi, in order to climb Mount Sibayak. At 2212m, it represents a personal altitude best for this author. Although the volcano hasn't erupted in over a century, it still has great jets of sulphurous steam gushing out from its slopes. Fortunately, having brought up two sons, I am no stranger to toxic gas vents, so it didn't pose a problem.