slim pickins, I'm afraid.
3/17-Epcot is open later
3/18-MK is open earlier, Disney MGM Studios is open later
3/19-Animal Kingdom opens early, nothing is open later
3/20-MK is open earlier, Disney MGM is later again. I guess the week of the 20th, they set up a new schedule for the parks extra magic hours, and you're unfortunately arriving when that happens, with a short stay to boot. But you've got Epcot & MGM, and I'd really suggest you hit MGM hard during the Fantasmic shows.