I want to be cremated, put in my girl friends douche, and get in there one final time.

My first choice would be to have my remains donated to science and let them use whatever the heck they want to. I'm dead, what do I care.
Second would for me to be cremated and scattered over various places that I really like. Maybe also pick a nice spot and plant a tree where my ashes are mixed with dirt used in planting the tree.
I don't really get the point of graveyards. We don't need to bury our dead. That just seems like a waste of space.

I want to be composted.

[google.com]

This particular facility looks like what I imagined the Dying Hospital to look like in Aldous Huxley's Brave New World. That sealed the deal. ?

Assuming I'd be relatively healthy meat, it would be nice to be laid out on the African Plains, and get recycled into all those wonderful animals (assuming they wouldn't be extinct !). But I l know that's likely not allowed.

So next choice is being part of the Body Farm, to help catch bad guys ! That could work.

Cremated and then my ashes spread in either a vineyard or Gobeklitepe. I can not fathom the thought of being buried in a box filled with chemicals. What a stupid concept.

Google Bios Urn... I want something like that, basically the exact idea you have, but (hopefully) done efficiently so that you don't need to buy a coffin.

I thought i wanted to donate them to medical science and sent off for the forms then found out that they might now want my dead body and it would have to be disposed of some other way so probably cremation...

I'm thinking an old fridge box and a trip to the landfill.