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.
Good advice here ^
You'll find nothing in Dubai airport (pleasant though parts of it are) to enhance your experience of this big wide world ; taking the opportunity to see at least
something of a new city is always going to be a more rewarding option.