First, don’t spend money on it. That is the most important. Second, if possible make something useful of my body, like donating to science. I listened to a podcast about this “cemetery” that is a research facility and they let the bodies decompose in a variety of situations to study the process. Third, don’t do any funeral or rituals and that includes keeping a cemetery lapid or stuff like that.

One exception is if someone wants to do something really funny and weird, like the guy that wanted his skull preserved and the rest made into two diamonds that would be fitted to the skull and to be kept like in the living room to judge everyone or something.