1. Use this phone charger
You're gonna need to charge your phone at some point, and rather than use one of the super-boring plug stations, hit Rick Bayless' Tortas Frontera in Terminals 1, 3, or 5, where all of the bar seats have outlets and all of the people in them have tortas.
2. Two words: open bar
If you want to combine working and drinking, and throw in a shower for good measure, the newly opened Terminal 2 United Club is where you want to be. Snag a day-pass for $50 -- or get guested in by a member -- and get access to free Wi-Fi and an open bar.