An old public service commercial I saw warning about the hazards of alcohol intoxication showed a man drunkenly staggering out of a bar, onto the street out of camera view, then the sounds of tires squealing and a horn beeping before a loud crash, as the narrator intoned, "Too bad he had to get smashed..." Saturate your body with alcohol before falling off a high bridge for example (maybe into oncoming traffic).
If an autopsy shows you're intoxicated, then an accidental death may be the only ruling available as a conclusion. .
You could also make it look like an unsolvable murder, clandestinely spiking your own drink with SN at a bar or restaurant for example.
Have an open mind and be creative. There are plenty of accidental deaths which have been videotaped and filmed which you can find footage of on sites like LiveLeak and BestGore. (One negligent death on footage shows somebody on their cellphone negligently walking into high speed traffic without looking and getting catapulted dozens of feet into the air, while somebody in India casually hopped on top of an electric train and causally placed his hand on the high voltage overhead wire, causing him to get instantly fried by a white bolt of lightning.)
Get really drunk, then climb up a high powerline pole or water tower with spray cans of graffiti paint before taking a long dive down. The autopsy will suggest a drunken prank rather than suicide.