A basic list of thing you want to do before you go, like have a nice meal, get 12 hours of sleep, tell your boss you fucking hate them. Just do what you want, because with a date like that, you make the most of it and enjoy it, no fear of the consequences since you won't see the fallout. However if i would recommend one thing, make a note of what you want done with your stuff, like if you want it donated, burned, or sold for anyone. Just know, it's your time, do what you love, and have fun before you ctb.