We generally do "favorites" day on our last day and visit at least three and sometimes all four parks. It does help to have a plan going in (and since it is your first day, it probably wouldn't hurt to familiarize yourself with the maps in advance.
I just looked at my trip diary from last December and we did the following on our last day (which explains the blisters I nursed on the flight home).
DHS: RD - TSM, RnR, Animation Academy, Starring Rolls Cupcakes
MK: HM, BTMRR, pirates, dole whips, PeopleMover, little mermaid, PeopleMover again
AK: It's thought to be a bug, EE
Epcot: living with the land, figment, walk around showcase, eat snacks