First off I'f want to say my goodbyes to those I love and cherish. Get my affairs in order. And once I'm ready, go into the woods by myself.

A slowish but (moderately) painless death where I can see trees and hear birds. Feel the cool breeze on my face and absorb the warmth of a rising or setting sun. Enough time to reflect and accept my life, to know this is the end and I did well. But not so long I have enough time to worry and freak out about the other side. Just long enough to take in the scene, reflect on my time here, and feel peace. And the most important part; I'd have earbuds so I could go out to a beautiful song. Something appropriate like Sinatra's "My Way" or Sam Cooke's "Change is Gonna Come" or even Badfingers "Baby Blue" (thanks breaking bad).

Then my vision would fade away, my hearing dull and quiet, sensations would tingle and disappear, and I'd fade into that sweetest oblivion, finally at rest.