Which city is the most convenient to fly from Kuala Lumpur to Borneo and Yiren, which is the volcano group?

Yes, the distance from Surabaya Airport to Borneo is not too far. Rent a car at 1: 30, arrive at the hotel after 6: 00 in the evening, stay in lava rock, and then walk to Borneo to watch the sunrise. Set out at two o'clock and arrive at the foot of the mountain at three o'clock to watch the sunrise. After watching the sunrise, I went to the crater to watch it. The volcano is surrounded by dark soil, the smell of sulfur is very choking, and white smoke keeps coming out of the crater. I arrived at the hotel at half past eight. There are horses at the foot of Mount Bromo. You can go for a walk.

You'd better take a coat to watch the sunrise, because there is a big temperature difference between day and night. It was mid-June when I went, and the temperature at night might be only about 10 degrees, which was quite cold.