Burning always helps, or sulfuric acid or whatever assorted goodies that help break things down. Either way if it's out of the way enough, and you don't think you could ever find your way back to it, it's good. Nearby woods will be searched if a bodies being looked for, so burying properly and making sure the location isn't obvious is important.
Unless you have a boat and an ocean and a rock and a rope. I wonder how many dead bodies there are along the sea floor tied to rocks... I guess sea life takes care of them. Then just cast your fishing line out immediately so you don't look suspicious, in the middle of the ocean.