I have booked a guided trip from Yogyakarta to the summit of the legendary Gunung Merapi on the evening of Saturday 20th June. At present I have 2, maybe 3 spare places for this, since the car can fit 4 passengers. The driver is picking us up at Yogyakarta railway station at 5pm on the Saturday, taking us up to Selo where we start the ascent at approx 1am. There's a guide and a porter, food etc... and we'd be at the summit for dawn and back in Yogya mid-afternoon on the Sunday (i.e easily in time for the night train back to Jakarta). Anyone interested in joining, email me and I'll send you the itinerary details etc..
danpquinn at googlemail dot com