Porn.
Actually, it depends on what I'm doing for the rest of the day. If I finish early in the morning and am going somewhere that day, I'll go home, unpack and repack my bag, and head back to the airport. After a late finish I come home and go straight to bed. MLB '08 for PS2 is also good.
A lot of you guys seem like crotchety old men. I sure don't have enough problems at work that I need booze and alone time at the end of every trip.
Lastly, I have the feeling that some of you who talk about getting poon all the time probably don't get near as much as you'd like us to think.