We visited for Easter maybe 7 years ago...Crazy that was long ago....anyways
We stayed for one night at the Grand Floridian and on Easter they had an Easter Egg hunt on one of the lawns on the grounds for little kids. Mickey and Minnie were there too dressed in Easter costumes. I'm sure if you call or ask at hotels they would tell you about any Easter activities going on.
Sidenote: We are DVC members and were going to stay at OKW for the duration of our Easter trip, but last min my dad booked us a room at the Contemporary for one night at the beginning. We got there, and they had overbooked the hotel so they gave us a room at the GF instead. That's how we ended up there for Easter morning!