How fun!
EPCOT sets up a fun Easter egg hunt scavenger hunt around the World Showcase - I participated in it this year and it was a really fun, new way to explore the countries. You can purchase a 'map' for I believe $5 at the merchandise locations at the front of WS. As you walk around the countries, you'll search for a large egg that is decorated like a Disney character (Fab 5, White Rabbit, Chip and Dale, etc.). Once you spot the egg (they're large and permanent, you can't take them with you but I wish you could haha), you'll place a matching sticker on your map. After you've found the egg in each country and used all of your stickers (they come with your map), you can return to one of the merch locations and receive a small prize! For the $5 that it cost, it was tons of fun! The 'prize' is cute and you get to keep the map as well which I thought were two really great souvenirs for the price.
Mr. and Mrs. Easter Bunny meet at the Magic Kingdom for the days leading up to Easter.
I also know that this year the Contemporary offered different Easter services on Easter Sunday if that might be something that your family is interested in.
I'm sure there are a few other things offered around property but that's what I can remember off of the top of my head!