I've already got my finish planned out: (hopefully from old age, in my sleep!)
1. Donate the used parts to anyone who can recycle them
2. Go to space!
Celestis: Memorial Spaceflights makes the dream of spaceflight a reality by launching a symbolic portion of cremated remains into near-space and even beyond.
www.celestis.com
I'm constantly amazed at what other people can use. When my wife's grandpa passed away, a gentleman stopped by the house after the funeral to drop off a note. Turns out he had been blind for like 7 years due to a workplace accident. Thanks to her grandpa's body-part donations (eyes), he was able to see again. I don't know if it was a cornea issue or retina issue or what, but I had NO IDEA that that was even possible! Really amazing that a loss could lead to someone else's life-changing experience!