I just baby the car from the main intersection near my house until I get to my garage. To me it should be plenty cool by then.
I probably don't have to but, I don't like to put her away wet. Like said above you can just let it idle if you are really paranoid.
It is easy to do if you turn off your car last, just get your stuff together, unplug your phone and all that crap then turn it off.