Orbital burial

Cryogenic preservation of humans is a neat idea, but it has one big flaw: the need for constant power. One little blackout, and your beloved starts to thaw. Let's preserve people somewhere inherently cold, where they can rest undisturbed for millenia. A long orbit around the sun sounds about right.

Once deceased, a body is sealed in a metal coffin, and frozen to prevent decay before launch. The rocket's liquid oxygen (if present) may be used as a coolant. The rocket is then launched.

Once the proper attitude is attained, the coffin is released to drift in the void until sufficiently advanced technology is able to revive the being within. A space blanket shields the unit from solar radiation, while a heat pipe on the dark side radiates accumulated energy. A small solar powered radio beacon aids in recovery, and provides gentle comfort to those mourning a loss.