party like a rock star....
seriously though, it's important not to panic. By now you're probably familiar with all the basics and such, so just relax and trust yourself. I actually went out for a few drinks during my last week. Of course, I felt incredibly guilty about not studying and wonder whether I would have done better....
I think it's just about revising the basics and relaxing. It's the last week, last few more days to freedom... no point stressing yourself too much....
go out for a drink, catch a movie... hook up... look for love....
I found surfing GMATClub.com very inspiring and did a bit of that