This would be similar to what I did when my son (1st child) was born. I'd probably:
Get up early
Give my wife some very special attention
Take my son and daughter somewhere to treat them and via conversation discuss some values I don't want them to ever forget to apply to their life.
Make sure all bills are paid up (less for the mrs to be concerned with upon hearing I've passed)
Fly to see my mom, father and sister back home in Mississippi.
Call some LBs like JR and probably let them know what I have noticed is either their best attribute or what I may have noticed as their weekest (depending on which I think could help them the most to get to the next level in life.).
Call my high school director
Sit and write down some final thoughts: important moments in my life, general thoughts on who I hope my life has been an exxample of, thoughts on what my hopes are for my wife, children, parents, and sister.
Call wife and kids and tell them "I love you" one last time.
Periodically though the day, as I do daily, thank God, his son Jesus, and the Holy Spirit for allowing me to have a relationship with them.
PEACE!!!