Jari Arkko posted a trip report of his one day guided hike up the active Mount Batur volcano on the Indonesian island of Bali.
… as a climbing mountain it was rather mellow. I was still exhausted from the climb and got painful blisters on both of my feet. But it was clearly a mountain still full of volcanic potential, and the apes, local culture, and great views added to the interest. The guide agency that I used was Santa Bali …
trip report – Hiking to Mt. Batur, Bali, Indonesia
It costs around $65 if you take a guide.
besthike.com 