Try to get caught up on Netflix/Prime/Streaming Platform of Choice (Yes, caught up is a Sisyphean prospect, but you'll probably slip further behind after today!)
Read Battletech Sourcebooks/fiction?
Play another game you've yet to beat.
Step outside for the last time in the near future, smell the roses, say melancholic goodbyes to the outside world.
Related to the last point, go out to dinner with friends you will soon be neglecting. Say melancholic goodbyes as you prepare to leave and fight for the Restoration.
Cook up a large amount of food, so you'll have leftovers aplenty!
Go grocery shopping for necessary long term gaming supplies.
Drink.
Take a long, long walk or bikeride to get that last bit of exercise.
Any necessary errands for the next week or two, to make sure there is more time.
Catch up on your Things Skippy Mustn't do list reading.
Deal with your enemies lest they ambush you at your most vulnerable.
Enjoy the Sun for a final time (Or Moon if you're of a more Vampiric persuasion)