You should look into Bios Urn.

1. My brain is going to a neurology study.
2. Rest of my body to whatever science wants me.

I've given my life to science, I'll give my death to science too.

I want cremated and used to feed a tree pod. I want to be a big beautiful tree!

Donated to science, maybe they'll radiate me and bring me back as the first superhero!

I’ve always wanted to rot wheee I fell like any other animal, but because of this thinking man nonsense, cremation.

I am donating my body to science. The returned cremanes are to be interred with those of my husband. That way, our children will have a sense of "where we are."

I'm not so much decided on something specific, just so long as I'm not locked in a box. I am an organ donor, but beyond that, I could be just as cool with being buried in a way to decompose the rest of me usefully for vegetation, or a viking burial at sea. On the other hand, transhumanist tech could possibly make death nearly a choice--dare I say, within my lifetime. I suppose when I'd choose to go then, again, just wanting to be useful in some way, without needing my body nicely coffined for the rapture.