Ok, now that I understand a bit better what you are getting at. First thing to do is forgive anyone who you have a grudge against. I had not been given a certain amount of time, but I was told if the treatment didn't work I was out of options, so I had time to think about all the quality-of-life vs quantity questions. And about what matters and what doesn't in life. They say most people have many problems, people with cancer only have one and there's truth to that.
Then, you do what you enjoy most. It's really that simple. Do everything you can to be as healthy as you can in your situation, which, like many said, means getting rid of all the bad foods like sugar and starches and staying natural, eating real food and walking every day. People will say get your affairs in order, make out a will and such. That's all taken care of. The part that gets weird is when you go on living and then you have to decide "What now?" which is where I'm at now.

But yeah, it's usually not a situation where you can just take off and fill your bucket list, because most people in that situation feel like crap and are limited in what they can do.