An 18 hour layover in KEF (Iceland), what should I do?

It starts at 8am and goes until 2 am, what should I do during this time, will I have enough time to go in and out of airport (I’m from America so will have to go thru customs, or whatever the thing is called where if you’re a foreigner you have to get ur passport checked I believe and I know that takes more time). It’s going to be in early September and definitely want to see the blue lagoon, how much is a bus ticket there as well? And also has anyone had luck seeing the northern lights at this time? via /r/travel

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