Since almost no one is playing along, I LOVE this question, and I would in fact be the kind of person who would want to spend his last day in Disney (I'm not even lying, getting my affairs in order or seeing my family, are boring things, its your LAST day the last chance 2 be selfish, n if you family wants to spend time wit u im pretty sure they can take 1 sick day to be with you on your last day. I would....
Start off by waking up in Pop century (I'm ignoring that 5 minute away thing b/c I would actually spend the night before in Pop century). After waking up I would probably be the 1st one on the bus to Animal Kingdom (as of late, we have been taking cars to the parks, but when you take the bus idk it's just different, it's not the monerail, but it's STILL disney-esk). I would hope they would be giving DAK a magic kingdom hour just for me, but even if not I'm gonna....
race over to everest, get fast passes, go 2 Dinosaur, jump on it then hop back to everest, jump on it (back row), then use the fast passes to go on the front row, go over to KRR and KS, and then go back to Dinoland USA get on Primeval whirl and finish my DAK day on Dinosaur. At this point I'm probably gettin hungry, so going and using my safari card at DAK's Rainforest Cafe, get the motzerella sticks and the rumble in the jungle turkey wrap with extra ceasar dressing.
After leaving DAK via bus, we're going bak to pop to get the car and the stuff and move it into the contempory, while my family's doing that I'm gonna take the bus from POP to Epcot (b/c you cant do 3 parks and EVERYTHING you want in 1 day including crouds....ive tried

) get 10 of my FAVORITE desert (Norway's Cloudberry horn), if there is no line ride on the malstrum and SPACE, but thats ALL! If theres even a 1 minute wait, get my cloudberry horns and im out like the pet rock.
Since all my family had to do was take the stuff over to the contemp, and since I probably took advantage of the 0 minute wait on both rides (only 5 minutes but still), they're probably already on there way to DHS. So I decide to take the shortcut, going out the back of EPCOT onto the boardwalk, taking the road behind it and jogging/running to DHS and meeting my fam in front of the park (to save time).
After getting in rusing to Toy Story Mania to get fastpasses then back to the front of the park of ToT and RnRC (5-7 rides on ToT/2 Rides on RnRC, front and back, front last; or until its time to use the fastpasses). Then over to Toy Story Mania, back to ToT for the final time. There really isn't any places to eat that I like in DHS, all of the places are like blaa. I really like the idea behind the Sci-Fi Drive In, BUT it doesnt play full movies, it has like a 30/45 minute loop, and I've seen the same trailers 2x in 1 sitting. I would like it a LOT better if there was full on movies playing, I would probably go there everytime.
Now it's time for the grand finalie, the Magic Kingdom. Like always, gotta start by going to the right, opening up with tomorrowland, monsters inc laugh floor, space mountain fastpasses, buzz lightyear spacespin, go eat at cosmic rays starlight cafe (fav place 2 eat). After that get over to the haunted mansion, both splash and big thunder mountain (or FP for 1 of them), and the jungle cruise. In between any of this, if it's within 20 minutes of the waterpagent parade over seven seas lagoon, im peacing, going to the room, grab some cloudberry horns and chocolate milk, and watching that. After which I'm going to take the monerail back to the park and pick up where I stopped. I'll of course cut into this itenerary for a fireworks show. If there's stil time at the end of the night, I'll go and do laugh floor again, and end the night, and my last day at Disney on space mountain. Walk down mainstreet, go into the ice cream store on the left cornor (sorry I dont remember the name, maybe main street bakery?), grab a sunday (along with everyone else in the park), and go out to the resort monerail. Take my last lap around the track as i slowly enjoy my last ice cream, get off at the contempory, and call it a night after I took my final look at Magic Kingdom.