I posted this report on Raung, including how to get there, on the Lonely Planet Thorntree back in 2008.

http://www.lonelyplanet.com/thorntree/thread.jspa?threadID=1670088

Some extra detailed info courtesy of Teddy and Juri…

Approached by angkot from Bondowoso to Gerda Atak (3000 Rp, on Situbondo road) and by another angkot from Gerda Atak junction to Sumberwringin (5000 Rp, beware of overcharging). Base Camp is located in Sumberwringin village in a futuresque, round building with friendly stuff, the only exception being, that room prices are fixed by the authorities to ridiculous 150 000 Rp (double, WC outside). However, there is a small house nearby, where they might let you sleep for free, in case of unwillingness to inhabit same mentioned rooms. Distance to trailhead is 7 km and ojek price is standard at 30 000 Rp. The right fork before the antenna is about 300 m from Base Camp and after that one continues on the good asphalt road for another 2 km. There you take the left fork into a cobbled, bumpy road (small sign) for another 4 km through forrest and agricultural land. Ignore the small junctions on left and right and follow the cobbled main road.There is one more junction before the trailhead, where you can either turn left (don’t do it), turn right (and stay on the cobbled road) or go straight forward through the forrest (a shortcut, which after 10-15 minutes meets the road again). 10 minutes along the road lead you to the parking lot, which is the trailhead at around 1250 masl (sign – puncak). After you hit the trail, it is easy to follow. Stay on the main path through the agricultural land on the lower slopes and eventhough it gets overgrown at some places higher up (for short distances), i could not observe anymore forks and places with lots of options or question marks. There is absolutely no water on this north route, except the dew at morning time. Camp place (Pos 4) at 2350 masl is big enough for lots of tents and even has the remnants of a wooden shelter, but in case of sufficient time and willingness – the landscape and the views are far superior at 2800 masl (no real Pos numbering sign, but big enough for 3-4 tents), short distance below the tree line. A night here would be the preferable option also for a sunrise glimpse from the crater area next morning.

You can request the free Openstreetmap Garmin file for Indonesia via this link:
http://garmin.na1400.info/routable.php
Once your request has been processed the server sends you a link to download the file.

Thanks for posting your tracklog on OpenstreetMap. How do I actually get your tracklog from Openstreetmap? I have surfed around but to no avail. I am planning to do Raung in May 2011.

I uploaded the track of the Sumberwringin approach on http://www.openstreetmap.org