Call me paranoid, but whenever I park any nice car, I will double back just to make sure there is no suspicious activity. I figure most people with bad intent will strike just after you leave, anticipating that you will be gone at least a few minutes. If there are too many low lifes around, I'll just leave, and come back later. I started doing this after someone stole the emblems off my '78 Firebird Trans Am while I was in the gym. Probably evildave.
Michael