Hi,
Check out Mt. Sirung!
Mt. Sirung on Pantar Island is one of the less visited volcanoes of Indonesia, but one of the most fascinating. The trek from Beang is an easy 5 to 6 hours hike, mostly through beautiful eucalypt savanna and passing small cashew plantations.
A few kilometers to the north, you can observe the "birth" of a new volcano - the Koralau: on a small, featureless hill, a gas eruption occurred for the first time in February 2011, burned the grass in the surroundings, and created a small crater of only 5 to 10 metres in diameter.
For more info see:
BeangWalter