At night, you'll go to sleep to the sound of churning lava. Early in the morning you'll wake up to have breakfast, pack, and begin your descent (eat a good breakfast! The way down is NOT easy).
Here are some good-to-know tips for the hike:
1) Brings lots of water! People often go through 5-8 bottles
2) Temperatures at the summit can reach freezing (0 degrees Celsius), and rain can be common. Pack layers so that you stay comfortable and dry as you reach the top of the mountain.
3) The facilities are basic.