[Rippersnapper]

If not that, I think an abandoned well on the island would be the ideal place to hide a body.

Or septic tank. Any storage tank type object. Water tank. What about that oil refinery. Isn't that where the decapitated guy worked. Maybe he saw something.

[Dark Skies]

Yep...it's best if the soil doesn't have to be turned. Weigh the body down and drop it in.