Keep reminding people of the necessity for a will. I've seen families broken apart when there is no clear disposition of inheritance.
Regarding the end of the world within a week, I would take my credit card, go to Hong Kong, eat at every restaurant there. I would just get fat, dumb, and happy. I would not have to pay off my credit card after all. Selfish? Yep. Would not work anyway. No one would be at the restaurants. I assume everyone would be enjoying what's left of their relationships with fellow humans and families.