I like to park, open the doors and turn the radio on, (tailgate party) with the key in the accessory position all you hear is the warning chine going off non-stop reminding you that the key is still in the ignition.

I took the dash apart to get at the chime hoping it could be un-plugged, but found the same chime is used to warn / alert you have other things, so here is what you can do.

Open the driver’s door; on the door take a screwdriver, ball point pen, pencil, stick, or similar item and push the clamps in so it thinks the door is locked closed, No more chime!
Just remember to pull on the door handle to open them again before you try to close the door. You will need to lightly close the door and pull the handle again to get them to open all the way.

 

Excellent Post! :d