Wait until it is extremely cold in the winter and go out into the woods, miles away from civilization and just sit under some trees while wearing summer clothes (T-shirt and jeans) and meditate until I freeze to death.
Failing that, no idea really. I believe in an afterlife so the how of death isn't too important.
Dying of old age in a used hospital bed that other people have died in, desperately clinging onto life with all 10 fingers doesn't really appeal to me. Some ex-racecar driver was working on his farm when he ran over a bee's nest. He got stung hundreds of times and when the paramedics showed up he said 'I'm not going to the hospital. If I die I'm dying out here under these pretty trees, not in a hospital'. I could see his point.