Seriously, you don't need your corpse any longer. Unless you have religious reasons to preserve it, it could save potentially multiple lives and your healthy organs and tissue should be harvested because life is precious and sacred.
Now full disclosure: I'm very much an organ doner and need to get around to contacting some medical schools/research facilities to arrange donating whatever is left for research there (or a body farm to help investigators more accurately gauge times of death). I think everyone should be an organ donor unless they have faith-based objections to it (perfectly fine!).