We made our reservation for sunrise about two months in advance, for only $1. I like this process, since you know there will be a parking space somewhere up there for you.
We left the Kahana area around 3:30am and arrived at the parking lot at 5:45am. Along the way we stopped to pay our 3-day national park fee. They now have a person in a booth as you enter the park, checking your reservation, and taking your park fee. You no longer need to get out of your car to pay for the park fee out of a machine.
Sunrise was spectacular! It always is. This time the clouds seemed to swirl up and out of the crater, creating a glow everywhere.
Dress warmly, and take blankets from your hotel/condo. People are usually in a hurry to rush back to the warmth of their cars. But stick around longer, and drive up to the summit, for an amazing view. Take your time and watch out for the bikers (outside of the park entrance) on your way down.