Originally Posted by
DYKWIA
At 19:00, everything will be open. The malls don't shut until 02:00, and most of the restaurants serve food until 23:00 (some even later at the malls).
Burj Khalifa is open late.
I'd have a look around, have a late dinner, and head back to the airport around 01:30.
I also do this often - enough time to go out, have dinner, meet friends, go to a bar, then to return to the airport in time to visit the lounge!
Cancel the hotel idea though: use T3 arrivals luggage storage.