My suggestion would be bust the windows out with rocks and then toss a couple Molotovs in the open windows, but if you're looking for a more mild alternative, I agree with your ideas.
-Rip the wing off (literally rip, like tie it to a truck and floor it)
-Pour acetone over most of the paint, but on the hood arrange slice of balogna in a smily face pattern
-Shove some mothballs in the gas tank (basically converts gas to a very dangerous, very volatile fluid that will probably blow the motor and oxodize the entire fuel system and top end of the engine)
-Set it on fire somehow. My preffered method would be the aforementioned Molotov cocktails or some home-made Napalm