I hate to rain on your parade, but you may be overestimating the nightlife potential of MAO on a Wednesday night (or any night for that matter).
The airport is far from the city center (which is sprawling in any case). A long walk is highly unadvisable for safety reasons.
Your best bet might be the Touchdown, a sports bar not too far from the airport. Bear in mind that if your luggage is not checked through, there might not be any left luggage facilities there (and check in for your onward flight might not be open).