Before I pick up my car, things I want them to do. Make sure 12v battery is charged, change backup beep to one beep, lastest software upgrade to entunes. Anything else I should have done before signing the papers?
Other than the standard make sure the tires are at the right pressure before you go. And make sure the personal data is cleared (As I got mine that had like 3 other people's phones linked in... It might help to have everything set back to default for you)
