Headlamp, rather than just a flashlight. And find out if you will have a normal pilot- if you will, get in touch with them, and the site contacts. Ask them what you should bring, if you haven't already. Local guides are always worth checking with. :P
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.