Mount Bromo is very special with the spectacular sunrise panorama. Landscape of Mount Bromo, Mount Batok, and Mount Semeru that stand side by side at Bromo Tengger Semeru National Park. Mount Ijen is about 200km further east and involves a night hike up. Once you make it into the volcano, you will see the blue flames (only visible before sunrise) and see the most acidic lake in the world. You will meet the miners, they are the strong local villagers who work at night to collect sulfur using very low safety gear standard. They risk themselves carrying 60-80 kilograms of sulfur down the mountain twice a day and the income they get depends on how many kilograms of sulfur they can bring down. After the sunrise, Ijen Crater turns into a fantastic volcano that you will always remember. The acidic turquoise lake, the truly exotic volcanic rugged cliffs, the smoke of sulfur, and the ambitious miners, all these combinations may make you more grateful for your life.