Kaliurang, 25km north of Yogyakarta, is the nearest hill resort to the city and gateway to Merapi. At 900m, it has a cool, refreshing climate. During the rainy season, Kaliurang often sits in a thick cloud bank, but on clear days the views of Merapi are magical. The two museums are both worth a look and there is one great trek here too, making it a worthy sleepover.
On the way into the village of Kaliadem (3000Rp entry fee) you will pass the remains and foundations of homes destroyed in the 2010 eruption in which over 300 people died. Though the government has condemned the area, many lifelong residents have returned to reclaim their homes.