Hmm. I have a whole bucket list I started as a kid, haven't gotten even close to finishing it. Maybe I would try to do some of the things on my list.
Probably indulge in some good food, good sex, reminisce with family and friends.
But to be honest, as somebody who was sick as a kid, I realize that more than anything I would just want to feel normal. So I probably would not do much differently. I would prob even still go to work. And I prob wouldn't tell anyone I only had a month to live bc then I would have to spend the whole month dealing with other people's grief instead of being able to have a last blast.