RING OF FIRE ADVENTURE ZONE is a fairly new site.
The editor has since 1994 hiked up more than 20 volcano’s peaks around Indonesia archipelago, mostly in Java Island. And now has set up this blog to share his knowledge.
He recommends:
SUMATRA ISLAND
1) Volcano Kerinci
2) Volcano Tujuh
3) Volcano Sibayak
JAVA ISLAND
1) Volcano Merapi
2) Volcano Bromo-Semeru-Ijen
LOMBOK ISLAND
Volcano Rinjani
BALI ISLAND
Volcano Agung
… Others interested volcanoes in Indonesia are Tambora and Krakatau. Tambora was recorded as volcano which has biggest eruption in the history of world volcano eruption. Now, Tambora is already quite and frequently visited by volcano trekkers to admire it’s natural uniqueness, that impossible to be witnessed in others places. …
Personally I’d love to visit Krakatau, East of Java. A mythic destination that’s been in my mind since I was a small child.
besthike.com 
Hi…there, thanks for introducing “Ring Of Fire Adventure Zone ” here. I don’t know if you did it. Now I’m setting up my other blog on wordpress too. Did you climbed Merapi Volcano any way?? Now the volcano is active normal, sounds great to climb it, do you wish???