Fahmi Rizwansyah says:
Indonesia boasts more active volcanoes than anywhere else in the world. Many of them are very photogenic and invite for exciting excursions ranging from easy walks to multiple-days trekking tours. Some of the most famous volcanic eruptions occurred in Indonesia in the remote and recent past, such as Tambora (1815) and Krakatoa (1883), both events that left a deep impression in history.
But Indonesia offers much more than volcanoes: It is also an extremely colorful and diverse country, with dramatic landscapes, wonderful beaches, thousands of islands, and bustling villages. Visitors are delighted by the friendliness of the Indonesian people.
taken from http://www.volcanodiscovery.com/volcano-tours/destinations/indonesia/volcano_discovery.html
Cheers, frizzy2008.