Ideally, I'd like to be buried in a type of 'green' cemetery that I've read about that wraps a body in a fungus-imbued shroud that helps recycle the body, and buries it and plants a tree on the plot.
But I haven't arranged anything, it seems like cremation is the simplest option, after my father died my mom had him cremated and at the same time she paid for her own future cremation, and it made life so easy when she died. My parents already had cemetery plots and I think headstones too (I am bad, I have never gone to the cemetery because it is a couple hours away).