There are two ways to interpret this and the funnier one is that you're going fill a bag with helium and fly off into the sunset like in the movie UP.

That's not far off to what my actual plan is, but for the sake of "humor" I wanted to keep it concise lol

I actually have an idea based on the assisted suicide pods that I'll probably do. Just need to get an airtight head covering and a pressure relief valve to keep the internal pressure low enough that it doesn't hurt and hook up a tank of nitrogen to the head covering.

Supposedly it's the buildup of CO2 that makes your body freak out, so if you can keep expelling it from your body and the relief valve lets it out of the head covering while keeping the nitrogen coming in it shouldn't be too unpleasant... Hopefully... Lol I still have like 20 years to figure it out though, not doing anything while my parents are still alive.