This is situated inside Bromo-Tengger-Semeru National Park, beside Mount Semeru at East Java, Indonesia. For travelling there you have to go Surabaya first. Then you have to travel around 1.5 hour to Pasuruan and need to stay there. You have to start from there at around 2 am with a special zeep which will go through the hilly roads if you want to see the sun rise. From that point you have to start walking.

I believe if you travel once more, you will feel the same.