Clayton!
Also any multi-storey carpark, especially in areas with junkies.
i.e. cnr Russell & Little Bourke Sts.
Used to work there as a kid & cars were broken into all the time!
And how about a sub-thread on places not to drive your skyline?
Caulfield on Glenhuntly Rd & worse still Glen Eira Rd near Ripponlea Stn.
The local Torago drivers out there (yeah, you know who you are!) are undoubtably the worst, most inconsiderate drivers I've seen.