Nothing, probably you will be stuck in traffic and won't make it on time for your next flight!
Don't leave the airport. Enjoy it. It's like a shopping mall inside.
There are restaurants in the airport. That is your best bet. Try for 8-24 hour layovers if you want to see somewhere.
Yes I agree don't even try it. Just a bad security line while getting food outside of security can be grounds for missing your flight
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