I was just thinking about this. I would love to have my last moments in the fresh air, among trees and plants and water. There's a beautiful pond along the Appalachian trail in New Jersey (USA), and it is about an 10 mile hike to get there. The view is beautiful and peaceful and private. Shimmering water and great places to sit. If I wasn't worried about someone finding me (and either being traumatized or saving me), that would be ideal. Also, my method is leaning toward inert gas asphyxiation and that's not really viable to do outside unless I want to transport a tank of nitrogen on a 10 mile hike lol!
So, even though it's not the my ideal place to CTB, I will probably opt for a hotel room or something, so I don't ruin the spaces inhabited by my loved ones and risk them finding me. I don't want to do it in the car or home my husband shares with me, and I could never do it in a space sacred to my mother.
Now that I think about it, maybe that's also really inconsiderate of the hotel owners and staff. Of course I would do it in a location where the staff wouldn't see me when initially walking in (like the bathroom) and I would have obvious, multiple warning signs instructing the staff to call 911. Feels like no location is quite right for one reason or another.