Sikidang is probably not what you picture when you think of a volcanic crater. It's more like an open scar on the landscape, covered with rocks and ash in varying shades of gray, green and yellow. Scattered around the area are vents of varying sizes spewing steam and hydrogen sulfide, which gives the place its rotten egg odor. Some larger vents have filled with water, which mixes with the ash to form mud, which bubbles with the escaping gases. The focal point of the area is the large crater filled with bubbling mud and issuing constant billowing clouds of steam.
Kindly note: Tread very carefully in the area. Watch where other people are walking try to follow them. The ground can look like solid concrete but really be mud or a thin shell over a hidden vent. You could be seriously injured by being careless.
Admission to the Sikidang Crater is via a combined ticket for the crater and Arjuna Temple complex costing 25,000 Rupiah (1.50 USD).