Things are looking good for murder and or suicide.

Suicide can be faked most easily. Leave a suicide note, jump off a bridge and don’t resurface. Make sure there are plenty of people to see you and try not to drown yourself.

No one is around to see me do anything. I’m not much of cliff-diver. The bridge is 25 meters above a shallow, rocky, river in the middle of nowhere.

My options for suicide are limited. It’s crossed off the list. 

Murder is also fairly easy, but this often requires pinning it on someone else, which may cause moral dilemmas. It also requires that the patsy have a plausible motive, which I don’t have the time to work out right now.

Being murdered by a random person--like a mugger or a thief--is not likely to work, since your death is not easily verifiable; there’s no obvious, plausible motive to work with. The key is not leaving a body, but still making it obvious that you are dead. Smears of blood, teeth and body parts such as fingers are often sufficient identifiers, but use your imagination.

I could cut my fingers off or pull out some teeth. I just don’t want to.

Murder is out.

Accident is the hardest to fake successfully without having a body, so the best you can hope for is 'missing and presumed dead' conclusion. Climbing a dangerously high mountain, or hiking alone in the forest. Or driving somewhere and never making it to your supposed destination, leaving a burnt out car and smears of blood all over the place should work.

I am driving somewhere.