If I had a date set in mind, the month before I would live the high life and spend all my money in 3 weeks, obviously leaving enough money behind to take care of my affairs. I've always wanted to visit Canada or Japan, so that's a possibility.
The last week or so I would spend doing things I enjoyed in my childhood, 90s/early 00s gaming and cartoons, 70s, 80s horror movies etc. I can't really enjoy the things I used to do when I was younger, but I think if I knew my time was coming, I'd take the trip back once last time and enjoy every minute of it.
Actually felt sad typing that last sentence out there.